Well, I want an HD JSRF yesterday.
The two reasons I jumped from Dreamcast to Xbox were Shenmue and Jet Set. The music in Jet Grind set a new precedent for what video game music could sound like. Sweet Soul Brother (Jet Grind) and Aisle 10 (JSRF) are still two of my favorite music tracks from any genre.
Back in the day there were rumors of a MMO being developed and that's something I'd still want if the servers and cities were big enough.
But a proper entry into the mainline series...I'll kill all of you for that.