The thing that I'm hoping for is that this was a panic buy because somebody at Facebook got spooked that a killer rival VR social app might render FB gradually irrelevant. So the purchase was a defensive move only, to make sure that they leading VR hardware comes from their own house and can't be used to undercut them. I think it's quite possible they didn't have any concrete social VR application in mind. This would not be a strange move for a rich and paranoid company. I'll call this the "playing defense" scenario.
If FB really is just playing defense, then maybe they'll invest in Oculus to make sure it's the VR standard, but they won't really profane it with stupid Facebook shit, because they don't really know how to do that anyway, apart from maybe some app that nobody will really use (except maybe webcam girls).
Of course, if they really are playing defense and they realize that VR isn't really a treat to their market, maybe they will cut funding from Oculus and let the project rot on the vine. That's a real danger, and it would set back the field for a while.
On the other hand, maybe Facebook knows exactly what they want to do with Oculus, and they are about to bend the project to their evil will. Whatever that would be, I'm sure I would think it's an abomination. This is why the gaming community reacted to badly to the announcement. But even if this is true, it might not be a total catastrophe. The important question is whether the technical issues that make VR so hard (latency, pixel persistence, motion tracking, etc.) will be getting a lot of attention, or a little. If it is a lot, then even if the final product is larded up with stupid Facebook crap, a hack will exist to remove it, thus producing an excellent VR headset. I just wonder how much FB is willing to invest in fundamental VR research and hardware improvement. Hopefully they won't neglect this side of things.
The niche of 3D printers is with geeks who want to make stuff, but are uncomfortable around dremel tools, files, saws, sandpaper, clamps and glue. However, they are comfortable with software, know how to install quirky drivers, etc., so they feel like with a 3D printer, they become empowered make stuff without having any idea how to make stuff.
But you know, for the price of even a crappy 3D printer, you can put together a pretty impressive collection of real tools and materials. Just check eBay. Yes, your first projects will be crap, but as you get better, the work will get really fun, and you will be doing something new with your brain, which feels good. So figure out what you can't buy but need to have, and ask yourself whether it could be made of wood, paper machee, machined from brass, or made in a sand mold from aluminum (which you later finish). In many cases, the results will be better and cheaper if you don't make it in a 3D printer.
How many times do we get to "discover" that bears actually do shit in the woods?
(This is years after we've seen clear pictures of Martian flood plains, with obvious river channels. This is years after we've detected signals for hydrogen under the Martian surface. This is years after models of solar system history basically make the conclusion inescapable that early on, Mars would have had to have liquid water. And I could go on.)
If all else fails, lower your standards.