>>271258593
There are realistically only a few ways that Facebook will do FBT. One is when the market is big enough to support peripheral markets (similarly, that's also a good time for them to return back to the "premium" market). The other is if a competitor comes up with something with FBT and it's successful.

Basically, it's going to take a long time but definitely not forever. 

There is another option, but it's unlikely to happen before those other things happen. That would be where they are able to come up with a breakthrough technology that can somehow track the body without external sensor setup and without having to wear anything extra so you just put the headset on and it can track your body. Or maybe you wear something minimal.

Possibly >FBT collars