The classic levels in NSMB2 were given out for free. And when they do eventually charge money for it, it'll be $2.50. That's a far cry from asking the same amount as cash as a retail game.
There's something called franchise fatigue. Rehashing a well-known game in the NSMB engine is one way to start that process.
SMB3 graphics aren't good
ಠ_ಠ
games mechanics are even worse
ಠ_ಠ
Oh why do I even bother arguing with you when you spout the most asinine bullshit?
Right on, soulx. That guy has a right to believe what he believes, and Nintendo probably would make a ton of money reselling SM3 with the NSMB engine, but I certainly don't believe it's a good idea. (Plus, as stated, there are hackers out there who've done this to some extent.)
And I (like you) *completely* disagree that the graphics are better, and for god's sake, why would anyone want to change the game mechanics? The latter applies to virtually ANY game. I've heard of enhanced controls that make certain games less awkward to play without ruining the original challenge, but to change the mechanics is completely destroying the original game. (In the case of mario 3 i'm guessing you're referring to the physics i.e. the way mario jumps and can wall-bounce out of pits he would otherwise die in.)
The NSMB controls were much more forgiving that SMB3 (and far more than SMB1) but those old games were FUN and CHALLENGING because of it. If it ain't broke, don't fix it. Those games had soul (creative level design, each new entry was completely unique, etc.) while the NSMB "series" is the same bullshit over and over...