XboxOne family: 55m Microsoft has been struggling to expand their userbase and i see them continuing to do so X is aimed at a very small audience due to its price, they have a very pronounced lack of compeling exclusives and they are far behind in tempo compared to Sony. Launching their next generation after Sony could be very hard to overcome but at the same time launching before means X life would be very short which is not very interesting. I can't see anyway Xbox One gains momentum before the next generation is here.
PS4 family: (110-120 which i will put as) 115m Right now Sony is in a very sweet position, with probably 75m sold at the end of the year and their strong line up for 2018 i think 100m is a lock, the question is how more they can sell beyond that. I think next year will be another huge for Sony, similar to 2016 and 2017 thanks to Spiderman which is the only title i see gaining huge appeal beyond the hardcore demographic Sony is targeting at the moment, 2019 will slow down since preparations for the new console will start and i see a 2020 ps5 release which will slow down drastically ps4 numbers. +-20m 2018, +-12m 2019 and +-5m 2020 puts the ps4 family in the range bewteen 110m and 120m.
Switch family: Switch is in its early life (this is its 7th month in the market) so is the hardest to predict, and also the fact that Nintendo is a destempo of Sony and Microsoft makes the predictions way more tricky. Since that is the case i will give 3 possible outcomes and highlight the one i this is the most likely to occur.
1) 80m: this is the most conservative one, and i think the minimum numbers for the Switch. Right now Switch has huge momentum in its favor and Nintendo is handeling the buzz amazingly well, 16.7m in its first year seems almost a lock at this point and first years don't tend to be the best ones. If then you take into consideration that Pokemon, Animal Crossing and Smash are yet to come, the price right now is very high for a handeld and probably will go down, Switch seems like an easy devise to make revisions of to satisfy diferent target audiences and that it will probably have a life cycle of 6-7 years (2023-2024) Nintendo will have to make a massive mistake not to reach this number just by what we know so far.
2)130m: that is my prediction for the switch, with all i have mentioned above Switch is in a very good spot and i will say 80m is the most conservative estimation i can make. 130m seems a lot but i don't think is that difficult to imagine. Switch and the IPs it attracts have a wider appeal than any other console, and while it works as a home console, in many ways is acting like a handheld, the most important onebeing that i don't see unusual more than one Switch per house, which can increase a lot its numbers. Add to that the possibilty of Nintendo creating a new IP with huge mass appeal like in the DS-Wii era, another Mario and Zelda for the console and new and varied revisions, i think 130m are reachable. Maybe is the high end of the predictions, being 120m the most safe one, but i still think it is a very reasonable number.
3)+150m: this one is here just by 1 possible event that may or may not occur, but if that event were to happen i think 150m is the minimum it would sell, that event is of course a deal between Nintendo and Tencent to release the Nintendo Switch in the Chinese market. There are rumours in the air, mostly because of Arena of Valor being on the Switch, that those 2 giants are having conversations, obviously we can't say for certain that this is happening but that is the fun of predictions i guess. Right now the Chinese console market is one with huge potential but hard to enter thanks to the lack of home console culture in china and the restictions of the Chinese goverment, Sony and Microsoft are trying to get into the market slowly and Nintendo is far behind, but with a deal with Tencent, Nintendo with the Switch could get the first position easily and if it were to take off in that market the numbers would probably be extremly high. Again, that is based in speculation and some not strong rumors so is hard to bet on this one, but i think there is enough here to consider it a possibility worth to explore