I feel nearly everyone expected the Xbox 360 successor to continue the domination of the 360. I don't expect Sony to make a colossal mess of their brand like Microsoft did, but I'm with benji on this one.
The average day to day consumer will move with the tide.
This is key I think.
In politics, you have a group of people that regardless of any and all facts, crimes, whatever, will absolutely vote party line, unwavering. It's similar enough with extreme fans of gaming brands. When Xbox One launched, I remember looking at it @ $499, no game, and thinking .. ehhh. But it indeed had a very diehard group of people who lined up to get it day one, despite the higher price, lower specs, etc. Then from Jan '14+, it began to crater out. The core Xbox fanbase was not enough to take it to a mainstream success at that price point with the market realities of the competition. I think Microsoft, and indeed most of us who follow such things, seriously overestimated Xbox's brand value in the US.
We honestly should have known, because it's almost a mirror image of how Sony fumbled the PS3 launch in overall 'whoopsie daisy' factor. Maybe a few million diehards are out there that will buy a literal box of dirt with their favored brand label on it, but beyond that, you have to have a good product at a good price with good marketing/consumer facing communication. X1 OG was a mediocre product at a bad price and with horrible optics/communication. This was poorly timed, as PS4 launched as a good product, with good pricing, and great optics/marketing(aided further by the stronger 1st party ending Gen7 2011+). Going back to Gen 7, 360 launched with a good product (marred by some flaws like no HDMI, RROD on early models), decent price, good marketing. PS3, delayed, was a good product (almost amazingly overbuilt, Wifi, HDMI, BDROM, etc), at a bad price, and with borderline disastrous marketing/communication.
Nobody can say that so much loyalty will carry over that the general consumer will choose PS5 over Scarlett, or vice versa, on just brand consideration. That's for diehard fans who typically aren't swayed by logic to begin with. Whoever comes out with the most compelling mix of product, pricing, and message, will win.
I will say, that as much as it disappointed me that Sony chose to make PSN a paid service, that it was actually kind of brilliantly (if not accidentally so in this respect) timed. Sony running into such an early lead, then extended over the years, meant that for all but the most casual (not an insult) PS4 owners would have to be invested in the service to play online MP, etc, and accumulating PS+ games, digital libraries, and so on. This is obviously a FAR bigger factor than it ever was in Gen7, just going by both published and leaked numbers from the companies themselves and other insiders and NPD figures. If both PS5 and Scarlett are, as expected, fully BC with the previous gen, and libraries and online subs carry over seamlessly, I do think that will
reduce people leaving MS for Sony, or leaving Sony for MS. Just as it makes it far less likely for someone to add a second console than before, when it means so much investment : console, peripherals, games, AND another $50-$60/year AND not carrying your library with you. Towards the latter half of Gen7, it was easy for me as a 360/PC gamer to grab a PS3 slim, and start getting games, because having to pay for another sub wasn't a factor. I definitely wouldn't have been as interested if it meant $60 mandatory PS+.
The competition really has made MS far far FAR better now though. Remember some of the absolute bullcrap from the bad old days when they thought they were unstoppable? Want to watch Youtube? F you give me money. Want to watch Netflix? F you give me money. The paywalls were just asinine. One remains : the free-to-play paywall. As much as they've improved, that's a blind spot. PS4, Fortnite and such, jump in with your $199 bundle, and your Fortnite-loving kid can have a blast with no additional sub/charges. XB? F you give me money. Given their overall moves, I think this is only a matter of time, hopefully.
I do think PS5/Scarlett will start slower than Gen8 though, and perhaps never hit the same numbers. When Gen8 came, it felt like it was drastically needed. Budget PC gaming blew the consoles away, the ~512MB of memory was just a beating on developers, load times were ass, UI kept getting worse, sub-720p, sub-30fps games were disgustingly common, it just felt like Gen7 was so far past its prime even by 2010 that fresh blood was needed. PS4/X1, especially with the refresh models available for those so inclined, aren't suffering much playing any competently developed games, and support is far steadier, especially compared to the dark Kinect days of 360.
Now? Besides the sometimes disgusting bottlenecks from the Jaguar CPU performance (most notable in open world games) the systems are pretty well rounded, and crucially aren't particularly limited by memory or GPU performance. The leap between even an OG PS4 and a hypothetical 12TF 8C Ryzen 16GB Ram PS5 will mostly mean about the same games, but better a bit better resolution, framerate, and textures. Take someone sitting 8' back from a 55" TV, and a game at 1080p vs ~1440p vs 4K doesn't look tremendously different. I think HDMI 2.1+ and variable refresh TVs will be where it truly shines through. Being able to play at unlocked framerates bouncing between say 55-120fps at 4K will be mindblowing for people that haven't experienced a good Gysnc or Freesync setup. Hell, I dumped my OLED 4K 60hz as a PC gaming display like a hot potato once I got a 34" 1440p Ultrawide Gysnc. The experience was just
miles better, despite the resolution gap. I think it's pretty much a lock that PS5/Scarlett will support VRR completely, but of course a sticking point will be how few people will have VRR capable displays for quite a while. The new HDMI spec isn't really available yet, but should be getting started pretty widely by 2020. It's a wicked upgrade over the limitations of current HDMI.