I didn't comment on the revolution part. A revolution like the one we had before I do not think is possible or feasible. The only way that could happen is if for example Bush decides to stay in office indefinitely. I think then you would see some people taking up arms. I don't see this happening though.
I do predict more protesting like you saw at the beginning of this war. I think a lot more people will be voicing their opinions and trying to force change.
I also wanted to add another thing that would fix this government. Remove the electoral colligate. It is not needed and the people would actually "vote" for a president and the most popular one would win.