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ChibiIceClimberz
Yeah, I never thought about that limitation. However actually thinking about it now I don't believe there would necessarily be much of an issue. When I think about taxing games, in regards to technical limitations, I automatically think of Kingdom Hearts 3D. There would be at times, enough enemies to fill the screen, all in beautiful colors and wonderfully modeled with effects from your abilities and what not blaring out constantly and there were only rare occurrences of lag. Even with 3D on it was barely an issue.
Now thinking about Smash, a 2.5D game where the models are limited to only x and y directions (strictly character speaking), and where there wouldn't necessarily be enough action going on to fit the screen, I really have no doubts in the developers ability to avoid most if not all issues so that we have a wonderful playing experience. (Holy long sentence)
Then again when I play Pokemon Y I get immense lag like you wouldn't believe in battles when the 3D is on. So in terms of being able to handle any game, I guess all it comes down to is the developers.