I would kill for a new game with only the original 150. or 151, whatever. Black felt like a decent return to the original roots for the series, but some of the pokemon designs/names are just ridiculous. They seem tapped out of good ideas. So stop trying to force new pokemon and give us new stories with the ones that work.
it would provide a strong sense of nostalgia for those of us who played the original, and I'm betting that half of their audience would find the original pokemon new, since they're too young to have played it the first time they came out. it's a win/win.