There would not be freedom of movement if TTP was not present in the area, or it would be very limited or it would be reliant on ISI.
The US has no loyalty to TTP, it is being used just to help them achieve their objectives. They can be eliminated..the US does not care. They would rather have them dying in Pakistan than to have them fighting against them via Afghan Taleban in Afghanistan.
There are apprehensions that large organised militants group could try to get the hardware, there is always room for improvement. However the improvement can only take place when you feel the need for extra security otherwise you can become fairly complacent.