Nobody really knows how Shenmue HD will sell. That is why it took SEGA about a decade to go ahead with this remaster. It could have been easily done on PS3 and X360 (and was, according to some rumors), but SEGA simply had no idea if it's worth pressing the discs. Now they were swayed over, but it's not like they are anticipating anything. They might hope at best.
These games are idiosyncratic in every possible way. They are their own creations. There's nothing else like them. Some later games copied a thing or two, obviously. However, no other game actually created such an experience. Ironically, even Shenmue 3 doesn't seem to be like Shenmue I & II outside of the characters and setting.
I'm so glad other people will be able to play Shenmue without the hassle of emulators, or having to find a Dreamcast + a copy if you don't have it. I've been pestering friends, colleagues, about giving a chance to Shenmue for years and now it's going to be easy!
DC emulators aren't even half as accurate as some people described them. As for real hardware, the real pain in the ass is not about finding a Dreamcast and a copy, really. It's the cost. Not only DCs and Shenmue I-II copies are criminally overpriced these days, but there's also the issue of DC hardware failing. Repairs are quite costly and annoying. Replacing the GD-ROM drive with a USB or SD card reader costs at least as much as a DC. Those devices aren't even that well tested. They overheat the original DC PSU, so there's also the cost of installing a new and improved PSU... It just piles up cash way too much for normal gamers. This is why this remaster is so important. Giving Shenmue to the people, basically.
The decision to port the Xbox version was a mistake. An average gamer won't even tell the difference, but ignorance shouldn't be promoted. It's a shame the truer, Yu Suzuki-approved version of Shenmue II for the DC will not be available for modern platforms. A wasted opportunity, really, because there are numerous texture and clipping errors in the Xbox port. There is back-fence talk that SIIX is actually based on an earlier Shenmue II build despite coming out later than the DC version.