I am personally done putting up with people griping about how the Muppets sound.
For me, one of the triumphs of MMW is that Whitmire, Jacobson, Baretta, Vogel, Rudman and Linz all knock it out of the park at every opportunity, in terms of line delivery, singing, puppetry and all-around energy. (Dave Goelz does too, of course, but we're talking about recasts.)
If I was ever lucky enough to be involved with any future Muppet production, I'd make anyone else involved sit down and watch MMW, and basically say, "Here's how it's done, folks."
Seriously, with all due respect to the original Muppet performers, I even prefer the new "Together Again" to the original.