Uhm, no. Why? The only reason it was in G/S/C was because the game was completed too fast and they only put it there so you could challenge Red and the Kanto Champion Blue. After that, the game had nothing in it. Now with WiFi, you have competitive battling,or jst battling with friends casually. So now you just train Pokemon and use them. If you don't have WiFi, well there's always link battling with friends. Anyway, the bottom line is, the after-game is fairly packed and there's no need to extend the sotryline when you have something called Pal-Park there for getting pokemon you wouldn't normally be able to get in-game. So no, they don't need to waste time making it.
I can understand your reasoning, but what most people expect when these sort of questions are asked is not how much more pokemon you can capture, but how much more you can actually do in the game. Challenging more gyms would be a fun experience, especially if it was another region where it was actually
hard. Gold/Silver screwed us over by making Kanto trainers and gym leaders oo easy and low leveled, despite the fact we beat the elite four. Mainly, I would like to see a challenge in battling, and while capturing more pokemon is nice, that would neccesarily be my main concern.
Wii I'm afraid to admit is too boring for me. Who remembers the old pokemon stadium game on nintendo? You could choose from the pokemon and make your own team and battle the computer. The mini games were the best! Being a Scyther and cutting wood or a Furret with the balls and stuff. Awe, those were the days. And if you hooked up your game you could actually play the game on the nintendo screen. That was some hardcore technology back then.
I would certainly like to see more added to Wii, and most definitely the new game, if they make a new game (not Platinum).