Its quite simple really..
OR will get released, if there is unwanted FB bloat, the early adopters will scream about it, and OR will collapse as the bulk of the gamer/enthusiast market avoid it like the plague. On the other hand, if there is little FB bloat, then it could well become a success..
What I expect will happen, is that there will be OR, and there will be FBVR software bundled with it, I don't expect that FB software would intrude into other applications, as for one thing, that would be a legal minefield for FB as 'running ads before level start' as has been mentioned above, would usually be frowned upon by game developers.
Right now, to be honest, nobody in this thread has got a damn clue about what is going to happen, we're no better than any number of other panicky gossipmongers.