However, I think that the total change in rhetoric is 100% necessary. The talk of the country had to change from one of "I'll beat everybody up " to one of "we will cooperate, compromise, succeed, and live peacefully".
Obama inherited two wars that he cannot just walk away from. I don't think he will start any new wars. He has to work on his own country first and gain its support for peace in the world. With so many generals with much experience he will have to work hard. Someone once said generals make great leaders, but it's hard to get them to follow. Some serious following has to be done to gain world peace.
I think Obama will be the person to bring about a much greater world peace.