It doesn't really help them until they need to start marketing. Even oculus/vive mismanaged the expectations of the public so there's no advantage to start doing it until you have to. Given how bad hololens(probably their closest competitor) is, magic leap is probably still a few years away.
And it's not their fault. Humans are biologically very good at vision so it takes a lot to trick our eyes and brains. I am sure no one is going to pop out of their garage with a better solution anytime soon.
Right now it doesn't matter where the capital concentrates at long as it's concentrating somewhere. Throw enough money/R&D/engineers at the problem and it will be polished enough to be declared solved. And at that point the world will change and no one is going to care how we got there.