They called for a jihad? So what? Do you honestly think that the Taliban has any credibility, especially on religious matters, within the Islamic world? Maybe you should actually study some world politics.
I'm stating obvious fact here... they are highly trained... and right now the common preception is that they will be pushovers. War has been a way of life for these people for ages.
Oh, please -- "highly trained"?? They know how to fire AKs, RPGs, and perhaps Stingers. However, their enemies to date have been themselves and the Russians, who were fielding a predominately conscript army in an unpopular war [their army was the most powerful army in the world...: Oh, please spare us the BS!]. The Russians were never as good as the West was led to believe, and that was proven in Afghanistan. They do have some good elite units, but the majority of their Army has always been, AT BEST, lackluster.
The Afghanis have NEVER faced anything remotely like the power of the US military. Hiding in Afghanistan is not as easy as hiding in Vietnam. There is a huge difference between hiding among rocks and hiding in a thick jungle canopy. Remember how everyone was saying how tough the Iraqis were before Desert Storm? Battle hardened from years of warring with Iran and the Kurds? We will not underestimate the Afghanis, but we will certainly not overestimate them. Sure, there will be US casualties, but there will be many more Afghanis lying in pieces on their soil.
Guerrilla warfare in Chechnya was effective...
The Chechens slaughtered the Russians because they were fielding an exceptionally piss poor military composed of borders guards, policeman, and poorly trained conscripts, some of whom had never even fired their rifles and didn't know they were heading into combat until bullets started flying. However, sheer numbers of men, armored vehicles and aircraft carried the day eventually. The Chechens were hardly what you would call an "elite" force, since many of them only took up arms just prior to the Russian attack, but they were defending their homes in an urban environment against Russian forces led by thoroughly inept commanders who apparently forgot all precepts of urban combat (like not sending armored vehicles in column down streets with multiple story buildings withOUT infantry support).
Nemesis: You might also benefit from some study -- in this case, military doctrine, tactics, and capabilities. Your scenario for an offensive against the Taliban is woefully lacking in reality. Send in the Marines?? They are poorly equipped for this sort of operation, despite their apparent mythic capabilities as stated in this thread. Special operations for unconventional warfare does NOT mean Army "Special Forces", which are a specific unit with a specific mission wholly unrelated to what you are proposing. You might be thinking of the US Army Rangers. Pay attention to what MadRat wrote.