I agree with the general thrust that progress is being made, and that the situation could completely unravel if we pull out. That will NOT be 'OK'. Strategically the opposition will claim that they won in Afghan, in spite of being consistently kerbstomped. Operationally you are going to see a concomitant rise in recruitment, and a return of trained indivdiauls from Afghan to other countries. Pakistan, Yemen, Iraq. All places we can't afford to get any worse because we have no rescue plan for these countries.
Having said this I cannot believe that the UK is going to maintain its commitment so I find it hard to condemn the yanks for cutting and running. I simply think it's inexpressibly foolish and wasteful.
This is not to say that the commitment to Afghan should be open ended. If it is that will only become a kind of colonialism. BUt the latrenative is that we need to deliver three things: economic growth, military security, and a political 'heart' or fire to enliven the minds of the Afghans. Yet I also think that all three are doubtful. We can't currently deliver economic strength in our own countries. The Afghan security apparatus is not as horribly compromised as Pakistan, but has a long way to go in terms of trade skills. And Hamid Karzai is a drugged up loon; not the kind of man to inspire a nation Ataturk style.