What in your opinion makes you think that won't be the case anyway, except tenfold?
Oh we'll be there for a while, but I think history is a pretty good indicator that if rebuild them and setup a functioning democracy and it can take hold, then things will work out quickly. We saw what happened in 1920s Germany when you defeat someone and then leave them alone, and applied those lessons we learned, to the post-war axis powers.
The biggest problem is that unlike a 1946 Germany or 1946 Japan, 2004 Iraq is a potential Yugoslavia.