The way I see it, this is good news that more and more 3rd parties are leaving the Wii and focusing on HD. Yeah you can give the doomsday theories that this will mean less and less quality games for Wii, but let's be honest here, were there ever really quality 3rd party games for Wii in the first place? Better to have fewer games and a few gems that stand out easier than a flood of shovelware that burries the few gems that there are.
In my opinion, a large reason as to why many good Wii 3rd parties don't sell is because the customers are suspicious of all the shovelware. The game simply gets buried in the amount of crap there is. Now I have been a big supporter of the PS2 ideology for game libraries that more games = better, because it offers more choices to the consumer. But the problem is the Wii is currently in overload, and after so much shovelware, you reach a certain point where it becomes more difficult for the average gamer to sift through the crap to find the gems.
I think slowly the Wii's library will begin to represent a more NES style library; somewhat less games, and a far greater ratio of quality ones, as more and more major 3rd parties get burned and "weeded out" with their shitty shovelware games and cheap ports. This will also set the table for aspiring smaller devs with TALENT on Wii developement who is more in tune with this new market to create better software for the platform, and who knows, maybe have a breakout hit.
Really, as long as I get the continued flow of quality titles from Nintendo, with at least a sprinkling of quality titles from 2nd and 3rd parties here and there, I will be a happy Wii gamer.