You know what the money during the kickstarter campaign was for? The first DevKit! They raised money for the dev kit and guess what? The people you chipped in got their dev kits.
As far as I can see, people got exactly out of the kickstarter campaign what they wanted. They helped to start the business of Oculus and in return even got the DevKit to experience the first results on the road to VR.
I hardly think just cause you started your business with a kickstarter campaign and gave the backers what you set out to give them should exempt you from ever getting acquired by another company somewhere down the road. If that were true, why go on kickstarter at all? That would basically mean you will always stay a small time player. If you can survive at all because you will have to do it all by yourself. Next thing you know, kickstarter backers demand that you also don't accept other investors money because then, these investors would also have a say how to do things.