Can I remind you that you're a civilian without access to official NATO documents hence can't really make an informed opinion on cutting our losses?
Also, I really hate people who use the fact that there's an Islamic government = automatic failure. I'd much rather prefer UAE style Islamic government than Taliban style Islamic government. Islam is an ideology, it isn't a group. Different groups that support the ideology have different interpretations. Some are more liberal than others. It'll be excellent to have a liberal secular democracy but we can't ignore the Afghan population.
I support the current plans to remove combat troops by 2015 then allow military advisers to continue on training/providing intelligence to Afghan troops so hopefully they'll have the power to remove the remaining Taliban. Currently, the Afghan military don't have the capability to fight the Taliban and removing our support guarantees Afghan becoming a failed state. Whereas, with post-2015 it could go either way depending on what happens between now and 2015.