Petraeus headed to NATO? What about Iraq?

The New York Times is reporting that Gen. David Petraeus might be given command of NATO. This perplexes me, for two reasons:

* During America's previous modern wars, there has not been the frequent shuffling of commanders while the war was going on. World War II was Ike's war, at least in Europe. Westmoreland had Vietnam, until it was clear it was time to move him out. But it seems as though the Army is sticking with peacetime promotion habits. Am I right about this? And if so: Is this smart?

* Is NATO still a prestige command? It seems like the president wants to reward Petraeus with the job -- and, who knows, maybe a year or two in Brussels is the reward. But if he's as key a guy as has been depicted, the proposed move doesn't seem to make sense.

Any military readers out there that can help me?