I don't see retail games being released in 2D unless they have a TON of content or user created/online like Little Big Planet.
Now on the other hand, Nintendo is absolutely crazy for not re-imagining their classic games for Wiiware. Can you imagine how well Super Mario Bros. 3-2 with 4 player online co-op and voice chat would sell? Or perhaps a Link to the Past 2 that played like an online 4 swords? Hop online anytime and continue your adventure with up to 3 other players. Their actions affect you and the story etc. It could be amazing, but Nintendo will never do it.
Sadly, Nintendo is marching to a drumbeat that I get more and more annoyed at as the years go on.
Now Playing!
^ This is you!