That actually sounds disasterously bad. It implies that following a US withdrawal, with the inevitable Taliban victory when NATO troops are withdrawn, that the USA's strategy should be to permanently keep Afghanistan unstable and ungovernable by keeping it constantly under bombardment and other forms of attack.
That would lead to just as much chaos as the current situation.
I posted the following 6 months ago and it seems were are moving towards that direction, if so, so be it.
Currently the goal is to stabilize Afghanistan and make it into a viable nation which opposes terror. If that fails what do you expect? Do you expect the U.S. to walk away like they did in the late 80's and allow terror organizations to operate freely and go unabated? Before leaving you can bet the opposition, be it the Northern Alliance or some other group, will be armed to the teeth to wage war with the Taliban. Undoubtedly the country will descend into further turmoil but as long as terrorists can't operate freely that will have to do, that will be the accepted victory.