I have noticed that the last couple seasons survival has had an extremely hard time playing in 3s with another melee, except for when things are completely busted like current feral. I think if survival had the ranged kick the other specs had it would do alot to alleviate this issue without causing balance issues. Counter Shot has a longer CD then Muzzle for the trade off of the range so I think it could work.
I think it could be as simple as give all hunter specs Muzzle baseline and allow us all to spec into Counter Shot, just as is done with Wing Clip/ Concussive Shot, so that nothing changes talent tree wise.