I’m not particularly optimistic, and I believe this has the potential to be a massive setback for VR rather than an opportunity.
Oculus up until now was an essentially an agnostic piece of hardware that was open for development in a variety of applications. Facebook on the other hand I wouldn’t expect neutrality from as they love their closed platform setup. I’d be apprehensive about their intentions because historically they have never been on the side of the consumer, and I’m apprehensive about their capability as they have also never successfully bought into hardware either. As a platform for software developers, Facebook has provided a fairly toxic environment that I know I’d never want to be locked into - constantly pulling the rug from under developers.
Ultimately, Facebook have a plan for this product. As the platform holder they are unlikely to care for other developers - they’ll be developing a platform to cater to their market and you’re competition, it’s not in their interests to support you or make your life easier.
Or to quote someone on GameDev.net: