Until, and unless, the people doing this analysis are Muslims, and not from the U.S., they are doomed to fail. We look at everything through Western eyes. I remember how the Iraqi military, armed with Soviet T72 tanks and doctrine, were going to wreak havoc on American forces in Gulf War I. The political think tanks overwhelmingly stated that the Iraqi people would resist us tooth-and-nail. They were wrong.
The VC removed the NVA "advisors" bodies early on, as this was supposed to be, as our media was so fond of pointing out, a "popular uprising". Iraq differs in that there is no North Iraq preying on a South Iraq.
My thought of "our" people is the same as in Vietnam. Politicians, and those who's knowledge is gained in the sterile envionment of academia, need to keep their abilities in perspective. Every time that they expected, and gained, public audience, they destroyed the public confidence. Worse, they forced the order of battle into a political cess-pool that only guaranteed the needless deaths of Americans.
Sorry, but I have neither the faith in, nor the experience with, the sources advocating that we will lose this battle unless we do "X" or "Y", to accept them for anything other than outsiders playing a game with men's lives.
Looking for past situations for guidance in present scenarios is prudent. Relying on assumptions garnered from what we didn't do in the past is a fool's game. It's not 1965 any longer. Vietnam was fought largely based upon lessons learned in Korea, strategically. Those lessons, and the advice of all too many political hacks, failed in Vietnam. The same approach will fail in Iraq.
For those who mention Somalia. That was doomed to failure from the beginning. Playing UN "target of opportunity", with such a small force, was ludicrous. We sent more men into Granada. Thank Clinton for those deaths.
The total number of foreign fighters in Iraq will be assessed later. I believe that the numbers, for purely political reasons, are being underestimated deliberately. There's an election coming up, and the politicians have repeatedly shown absolutely zero integrity during election time. Or any other time, for that matter.
If I'm wrong, I'll be happy to admit it. It wouldn't be the first time. However, I lived through the idiocy and corruption of the 1960's and 1970's, and have only a jaundiced eye to cast upon today's whiz kids, and their opinions.