You underestimate the 'deep state' which is not going to allow Mueller, one of their own, to fail.  Trump and his WH malware team are setting themselves up for big fall and the FBI, CIA, and many in the upper echelons of the military will see that the White House is eventually wiped clean of this existential threat to a democratic USA.

The deep state or un-elected shadow government will not allow the US Republic to fail from within. Give it time.  Mueller and his huge team are playing 3D chess while Trump even with his hired guns are still playing checkers.