I really would just prefer they use the same or very similar assets. I mean, making the best graphics games will see for 6+ years is one thing, but doing it all over again does not make much sense for a game they know would not be a huge seller.
And I would probably get it on all available platforms, but I would prefer it on the Xbox 360 myself. Dreamcast stuff just fits perfectly with the platform, even the controller is very similar.
Kind of off topic, but one of my favorite things about Shenmue is how you can slightly hold down on the right trigger to walk while you look around with the left analog stick. I mean, walking slowly while looking around in all directions is something everyone does when they are touring a place, and Shenmue is literally the only game I can think of that does it. I could not imagine doing this with that Goddamn R2 trigger-stub thing the PlayStation 3 has.