I seriously doubt that Americans want to be permanently at war in the mid-east, on one side or the other, with people that have been killing each other for 1400 years.
In other words, pretty much like how a majority opposed getting involved in yet another war in Europe during the 1930s, after WWI so recently.
I realize this disappoints interests in the US that favor continued involvement in the region. Americans elected Obama twice, on his policy of withdrawal from Mideast wars.
The best possible outcome might be for muslims to focus on killing each other for the next few year, at least until Obama is replaced.