I could dig going skydiving

. Anyways, don't get me wrong, I'm not all doom-and-gloom, but Facebook didn't spring $2 Bn for nothing. They'll want something for it. Given Facebook's core business, I find it hard to see what they want from Oculus not clashing with what people saw Oculus as envisioning.
Also, prior to the purchase, Oculus would have had a fair bit less money to make to justify its existence - now it's going to need to turn a tidy profit. This could push it towards being based on a closed app ecosystem, as the apps are where the money is (that standard 30% cut on Steam/PSN/XBLA/Apple's App store). I can't see them making that kind of money back on an open system, and to be competitive with Morpheus, they're going to need to sell their headsets as cheap as they can (and if the apps aren't in a closed ecosystem, the only way they make money is off the headsets - if Sony make their money off the apps, Oculus could be at a significant price disadvantage). This isn't necessarily a bad thing - Morpheus will almost definitely be in a closed ecosystem as well, but Sony have a lot of experience in this kind of thing, and have been one of the more developer-friendly ecosystems of late.
It could all work out fine, and Facebook may be the hero of VR in a few years time - I'm just throwing ideas around - but I've got far more alarm bells going off than I do enticing possibilities.