For someone who thinks Afghanistan is a burden on Pakistan -- I say good I hope they do.
Perhaps a collapse of the Afghan economy will knock some sense into the Afghan public.
If I was in your place, I would not wish for collapse of their economy. That will make hundreds of thousands of illiterate young men available for groups like AQ and ISIS.. With Pakistan's certain areas having blood relatives there, will not result good for Pakistan. No matter how crazy it sounds, but a stable anti-Pakistan Afghanistan is in Pakistan's interest rather than destabilized Afghanistan.
This. A collapse of Afghan economy might bring wrath on Pakistan in many ways Pakistan won't be prepared to defend.
That's why it is imperative Pakistan supports Afghanistan building stable economy in Afghanistan. Hence kudo to Pakistan continues its expanding investment in Afghanistan close to 1 billion dollars now. A stable economy of Afghanistan means the same for Pakistan as well. Unfortunately, Afghanistan cannot be trusted to be left alone as history attests to that. That's why Pakistan will have to interfere. Right now, Pakistan will be blamed, and many things, but in the long future, future generations after many decades may start to realize what Pakistan meant to do so.
A Prophet was sent to Makkah for them, but what did they do? I am afraid Pakistan might go through the same and people in Afghanistan and million Afghani refugees in Pakistan will remain thankless to Pakistan.