As much as the idea of Ep. 7 pains me, I wouldn't mind seeing Brad Bird direct it. He took another classic franchise that I had grown to hate (Mission: Impossible), and made it fun again. He also has close ties to Disney/Pixar.
I thought M:I Ghost Protocol was pretty mediocre. To each his own.
M:I Ghost Protocol was probably the most cartoonish thing that Brad Bird has done. I recently re-watched The Incredibles and... yeah, I can totally see him making a redemptive Episode VII.
Joss Whedon has been known to take home from the Disney offices large sacks with big green dollar signs printed upon them.