Why is this a big problem? If your scenario plays out after VR is really viable because of the extra millions that Facebook puts into the product, so be it.

At this point, the awesome feature issue isn't even really on the table based on my understanding. Getting the technology to be stable and solving all the issues with it is the main focus. I don't see Facebook getting in the way of that. If that does become an issue, Facebook will have earned the right after having likely spent millions in the three digit range to get it going.