I don't think much of any of the 8/16bit games would benefit from souped up modern graphics. Part of their charm was is the limits. Games now lack one huge thing, personal imagination. There's so much power even in the tablets you can create a level of 'reality' that leaves no real room left to have any imagination in what you're playing because the detail is there and the vision can be met. There was no way in hell with SMB (NES) or SMB4(SNES) those systems had the power to make such a hyper realistic level of cartoon that Zelda Wind Waker approached on Gamecube where the imagination was taken away. You were limited to a few dozen to a couple hundred colors and X amount of sprites and backgrounds, that's it. Your imagination had to fill in the blanks and create a world in your dreams and even as you played to bring it to a real level of appreciation of the design. The modern Mario game is like a living cartoon on the 3DS/WiiU, you don't need to think of the what if anymore, the detail is already there where the game look as nice as the hand drawn art and rendered stills in magazines, things the 80s and 90s console couldn't do.

So no, I wouldn't want to see an old game souped up to todays graphics as it would make part of them now a cheaper more hollow experience. Now if we were talking the 2600 like crusty graphics of the 1st gen console 3D games, then you have a case because even by the standards then they looked bad if you had a fairly decent computer/video cart/ram combination in the back half of the 90s.