I have TPCast for enjoy the best possible the free locomotion idea. The wire of the vive headset is indeed a trip hazard, even without using the walkinplace idea.
For example, I like full body capture motion idea for recording dancing VR avatar, and it impossible to do that with a vive wire ovre your head, that goes between your legs and in front of your feet while dancing....so defenetly the go wireless is a MUST for best enjoying free locomotion VR.
I find the treadmills a solution that goes against the idea of free locomotion that is also pushed by the wireless modules that are out and will come out and the wireless headsets in production.
I think the next idea of vr "long distance locomotion", should aim developers toward developing "play areas carpets" that allow you to extent you walking movement/motion when you reach the edge of your play area space.
I do not know. Just some thoughts. like a rolling carpet that rolls when u reach the edge of the play area, with nothing holding you in place/anchoring you...but it is easy to say, hard to develop such thoughts