I agree totally and completely. I think if they do a G/S remake, it should be on the wii.
I'd say that that would be unlikely at best. Firstly, unlike Colosseum/XD/PBR which was made by Genius Sonority, GSC had been made by Game Freak, who made all of the other main handheld games. If a GS remake did happen (which ain't confirmed by any means but is possible), it would be made by Game Freak, and on a platform they are familiar with and work with - the DS. Besides, the core titles of Pokemon end up being the handheld games in the end as well.
ya if they goin to make a big game on the wii it should contain all the regions that would be great
Also very unfeasible, if you look at it from Nintendo's perspective. So far, they have had great success in selling the Pokemon games which have at most one new region each - GSC had Johto and Kanto - revisited. The make millions of sales from each game - and this ensures long-term survivability and all that jazz. So why suddenly make one super-game with every single region?
If you did that, than despite the short-terms sales (that won't be much better than what they are already), sales would suffer long term - it'd be, for instance, far harder to promote new games - players would easily think 'why get this new game when I have this one with EVERY SINGLE REGION!'.
If you look at how hard it'd be to make it as well... although we all have the thought of how great it is, if one looks at all of the things that would have to be considered to make such a game, it looks like a very tough thing to realistically pull off.
And the main killer - memory constraints. Look at GSC - Kanto was visibly downsized because they couldn't really fit anymore into it. Brawl had both sides of the disk filled up or so I heard - and although the DS games have more memory than the GBC games, they have a lot more to fill up. When you get right down to it - nowadays it has to store data for nearly 500 different Pokemon and all their moves and where you can get them and all that stuff - then graphics, and maps... which takes up a lot already. Two regions might be possible to fit, but all of them on either a Wii or DS game? I'd doubt it, personally...
Besides - Nintendo like sticking to what works. And releasing games with one new region each does - same as the same old plot (get starter Pokemon, catch them all, beat 8 gyms, beat the champion, insert subplot involving legendaries/evil Team X) - which they've done ever since RBY in every core handheld game since. And it does still sell ridiculously well.