But both US increased the role for B1B and Russia increased for TU160 currently.
Not so much going into hostile territories but rather sneak in close enough, launch long range cruise missiles,hit and run. They can run fast
The B-One and the Tu-160 saw a recent resurgence due to the Syrian fight where the ISIS forces they were going up against presented a limited surface-to-air threat and practically no air-to-air adversaries they needed to counter.
Considering the potential adversaries the PLA will have to deal with (NATO and India in a nutshell, and not guerrilla ISIS or Taliban forces per se), I doubt a supersonic strategic bomber along the lines of the Bone or the Tu-160 would be able to consistently penetrate the multiple advanced layers of Integrated Air Defense, let alone go up against enemy fighters. Since the shootdowns of the U-2 by Russia/China/Cuba, flying high doesn't guarantee safety against surface threats... and well a bomber will never be quite as maneuverable as an intercepting fighter. Alas I see no need for the PLA to develop a sweep wing supersonic bomber, and why as far as we know the JH-XX has been placed on the back burner. I reckon stealth would be a much more valuable asset for a strategic bomber than speed.