I have no answer, I'm asking the same question. Who can raise serious funds like 1 billion to do it? I'm guessing for FOSS/Linux crowd to get fully behind, it can't be a company, but a person like Linus Torvalds. Given that browsers are becoming a platform themselves for major apps, maybe it can lower the bar in the future for smaller vendors to create a feasible market.
I'm hoping that Linus "pulls a git" and suddenly announces that he got fed up with Android last week and created a new OS that solves everyone's problems.
