I feel that it's possible for a reasonable person to feel optimistic and ambivalent about this development at the same time.
The question I keep coming back to is this:
If it's true that this was always the game plan, and the endgame for OR was always to be bought out by someone huge for crazy-money, what if the original Kickstarter pitch had included that information? If the original Kickstarter had said "...finally, just so you know, after we make a few prototypes, the plan is to sell to Google or Facebook or someone. Thanks for funding our A-round!" would they have gotten the same initial support/backing that they got from the kick-starter community? If the answer is no, then I think there is something to the complaint that maybe there was something disingenuous about the trajectory from kick-starter to Facebook-buyout.
It's easy to lambaste frustrated people as being "naive", but I really think there is a reasonable perspective that is maybe not super thrilled about this. It's certainly going to give me pause before backing similar ventures in the future.
Personally, I'm hopeful. If this development means we get VR faster/better/cheaper and with more games, then that's fantastic. Here's hoping!