"As for the Taliban, it appears that they have drawn their ranks primarily from the Pashtuns who are also Sunni Muslims, but that does not make all Pashtuns Taliban."

Not so much primarily, more like solely. then you have tribalism within the 12 million Pashtun Afghans coming into play. Of that 12 million only 1 in 10 supports the Taleban.

"I think that in the long run these Pashtuns, whether they are Taliban or otherwise, will succeed in driving out the coalition forces just as the Soviets were driven out before them."

And the reason why the non-Taleban Pashtun Afghans would take up arms against the coalition and government forces would be what exactly?? The Soviets were driven out because they had the enitre country up in arms against them. The same cannot be said with regard to the situation the ANA; ISAF & US-OEF forces.

"There will probably be an interim period while a client government propped up by NATO continues to rule in Kabul for a year or two, just as Najibullah's client government did for the Soviets when they left."

"Client Government" accurately describes Najibullah's Government, but certainly does not fit the current government in Afghanistan, which resulted from an election.

Going back to Najibullah's government and the Afghan National Army, they continued to do quite well against the Mujahideen after the Soviets left until the Soviets stopped supporting them with fuel, weapons and ammunition. Just the same as the US did in Vietnam, you stopped supporting the South, while both the Russians and the Chinese reneged on all the promises made in paris and continued to support the North.

After having turned over the security situation to Afghan Security Forces can you explain why the international community is going to turn its back on Afghanistan?