For all of us who grew up playing the side scrolling Megaman games, this is kickass. BUT............
I think Capcom went batshit insane. Do they really think most of today's gamers will give a new Megaman game with NES-style graphics a chance? Especially when there are tons of NES Megaman rom hacks with different level designs and graphics all over the net. Hell Megaman now is as niche as Romance of the Three Kingdoms compared to the "gangsta", pre-k games, and the shit load of FPSs and MMOs everyone is now into. WiiWare or not, Capcom isn't going to make anything off of that. This could be the last Capcom game we'll ever see....
Don't forget that there were a number of older gamers whom had bought the Mega Man Anniversary Collection (for the GameCube, PlayStation 2, and/or Xbox) to relive their old memories of playing these titles (among other reasons such as that their copies of the actual game(s) are unable to work, they wanted to complete their stash of them the easy way, etc.). A few younger ones, I can bet, too, have been able to explore (and even enjoy) the series by this mean (like me

).
The rom hacks might actually show a greal deal of interest in the series in general, since the bits never really change too much from the original (if they can, that is

).
Capcom's not likely to stop making games or go out of business because of the release of one title that would do poorly, if that's what you're suggesting. Keep in mind that they have the Resident Evil, Devil May Cry, and Phoenix Wright series running pretty strongly right now, and Street Fighter IV and Super Street Fighter II Turbo HD Remix are in the workings currently. A lot of folks have been anticipation a Mega Man 9 for a while now, and I think it'll definitely sell well once it's released.