I am really not only NOT worried about the Wii, but I'm looking forward to the future. The key thing you forget to mention was that NINTENDO was releasing most of its big guns this year. I really cant wait for the future because I truly believe nintendo's third party support is really going to take off sometime early 08, and its going to start with the GTA port for the Wii that I have strong suspicions about (although nothing backing up this, its just a strong gut hunch).
GTA port or not, I really feel 3rd party support is going to take off, (and its really already starting, but not nearly there yet). I feel there will be much less (not that there is very many now anyway) Xbox and PS3 only games, (as in those games will be also on Wii) as a FEW more 3rd party exclusives that simply have no real point in being released on other, more expensive to make, consoles due to only being good and new from using the Wiimote for things (things as simple as aiming in 3rd person shooters, but the 3rd person shooter be nothing real special beyond that).