It was a masterpeice. And now an absolute cult classic. There aren't many flaws with Snap to be honest... It's a very different take on an "on rails" shooter. The WiiU would be perfect (As well as the 3DS) for a remake or 2nd game.
I liked PBR to be honest, the game modes were often challenging but lacking minigames ruined it for me compared to the Stadium games (Hitmontop Beyblades and Classroom Clefairy were the best). I probably spent more time in the minigames than I did in the stadium modes...
Colosseum and XD were a very different take on Pokemon. Colo for sure was a much darker, edgier storyline than the main Pokemon games, and I think that was reflected very well in the cast/storyline. I wouldn't mind seeing another game of this type (but dear god give us more Pokemon options). With the advent of Pokebank, we have no need for a "game" along the lines of Ranch either. Europe didnt even get the Platinum update for that which was fairly dissapointing.
As for the future of the home games... I think it's rather hit and miss. Nintendo knows Pokemon sells consoles, but they are booming in the handheld market. They would have to do something very different to what X and Y can now provide to get people interested in buying the game.