Guys, I've fought Disney for a long time myself, for all the reasons that you mentioned. They're all good reasons. But the fact that is EM.TV has seriously blown it, and the Henson company doesn't really have any good options. AOL Time Warner and Viacom are just as greedy of corporations as Disney is. And they're not even in the running anymore. The other companies that have been vying for the Muppets are too small; they won't be able to fund that many productions, let alone create sufficient advertising for them when the product is finally released. And I don't believe the work would be of significantly better quality coming from companies other than Disney.
Disney has made some serious mistakes lately, and they're in financial trouble for sure. But they aren't going to go bankrupt tomorrow. They turn out a pretty constant stream of product, and for the most part it's well promoted. Plus, Disney merchandise is on toy shelves everywhere. And if the Muppets were bought by Disney, they could finally have more of a presence in the theme parks.
I hate to say it, but at this point, Disney is the Muppets' last best hope.