Ghosn is a kickass CEO. But there are only so many of him to go around.
Let's look at everyone in the industry with some clout:
Wiedking - Porsche - He only has to work with 3-4 platforms and a lot of shared parts in a specialty manufacturer with an awesome reputation. The cars practically sell themselves.
Pieche - VW - He had no sense when it came to how much things cost. He didn't care. As a result, we have Bugatti and the Phaeton.
Zetsche - Mercedes is doing reasonably well, but buying Chrysler was a massively terrible mistake.
Nardelli - Chrysler deserves to go under with him at the helm. He nearly killed Home Depot, and now he's doing the same at Chrysler.
...I guess the point I'm trying to make is that there aren't too many good auto execs. In the book, "The Six Men Who Built the Modern Auto Industry," the author writes about Lutz (bringing Chrysler into the modern era), Iacocca (need I say more?), Ghosn, Reitzle (Where has he been since leaving BMW?), Honda (dead), and Pieche, among a few other less significant leaders. There aren't too many dynamic leaders left with enough spunk to change things.