every comment is about SNES. its useless to fantasize about SNES games on 3DS. Nintendo decided not to devote time to it, and never will.
and from a Business standpoint, i completely understand why.
(remember the great video game crash caused by Atari flooding the market with too many games). if they release the same game on every system people will get sick of it, and will probably not want to Re-buy it again anyway, and will criticize.
thats why Earthbound release was a brilliant marketing strategy. its like fishing, tease them till they get hungry for it, then reel them in. personally i would rather they devote their time on a BRAND NEW Metroid or F-Zero game, then bloating up the eShop with a game i have been playing with an emulator since 1998.
besides SNES is more suited to a home console rather than a portable. its better on the Wii anyway. the best SNES games are RPGs and Strategy games.
NES is a little different, in that most NES games are short and fast paced, and are better suited for quick bursts of gameplay. and the simpler graphics style means a 3D upgrade will be more noticeable.