I doubt resistance among the Sunni will end then..
I don't think these attackers have much to do with Saddam. This is starting to look a little too much like Chechnya for my liking.
Nope, this is going to be guerrila warfare...and it was obvious that this was the Iraqi strategy from the beginning. "How to defeat a western occupier 101". Lessons from "Palestine", India, Vietnam.
Flood the country with forces, pacify the population, be oppressive where you have to be, have a big carrot where needed. Make winners and losers. And don't arrest anyone. Kill who you need to, quickly and with no remorse or hand-wringing. Reward everyone you don't need to kill.
Even that may not work...but it's the best chance.