At this point the Wii can't really be helped much. It desperately needs games, but convincing 3rd parties to support it when a successor is on the way is pointless. That should have been done back in 2006-2007, but its too late now.
The consoles need to be marketed to two very different groups: developers and consumers. The Wii was obviously successful with the latter, but not so much with the former. Right now is the time when Nintendo needs to get developers on board with the Wii Stream Cafe. Not 5 years from now when its too late. The alliances must be formed NOW!
Even if they have a strong initial showing, that doesn't mean much based off of the past three Nintendo consoles: N64, GameCube, Wii.
I think the GameCube and Wii mainly show me why we should take third party support of Nintendo's next console, with a grain of salt.
GameCube, it was a big surprise when Nintendo(or Capcom?) announced Resident Evil 4 as an "exclusive" for the system. The system even started out with a great exclusive, with Rogue Squadron...
The Wii had Red Steel, Rayman Raving Rabbids, and some others early on. It just seems that Nintendo wasn't willing to approach third parties, or seemingly just lost third parties, and couldn't do anything to get them back, but three console generations don't bode well as a track record of what we can expect moving forward...even if they are formed NOW, Nintendo seems to have had the magic touch of losing them quickly.
I really do hope they prove me wrong with their next system, we will see soon enough I guess.
The games aren't even what really concern me though, as much as Nintendo's other business aspects, such as online aspects and being extremely slow to update things.