Originally Posted by WinstonSmith
I guess there just isn't a market for them anymore?
If by 'them' you mean '2D platformers' then the answer is no, just not much of a market for them on the big consoles, other than through the virtual console on the Wii or the Xbox Live Marketplace. On the DS (and to a lesser degree, the PSP) you can find them by the truckload, really. 3D platformers have largely supplanted 2D platformers on the newer consoles.
New Super Mario Brothers on the DS sold some 7 million copies, so I think it's safe to say it was well received.
If you're jonesing for an old-school 2D platformer, I'd either get a DS, or download a game on the Virtual Console.