I actually wish B/W had done the national dex thing, and then B/W2 was only new Pokemon. While I played B/W, I was wishing the old Pokemon were there... But when I played B/W2, I was used to the new Pokemon, and I actually liked being restricted to just new Pokemon. It made the game a little easier, because I didn't have to remember the type of all the old Pokemon, too.
For the next game, I'm hoping it's like 90% new Pokemon. I appreciate the old standbys, like Pidgey (or better yet Starly,) and the new evolutions, but I really would like the main game to be mostly new Pokemon. I really like getting to know all the new ones.