But is it? Corporations have to turn a profit. They can't fall back on taxpayer money. To date the only profitable venture in space is telecommunications satellites. What could humans possibly do in space that would offset the enormous cost of getting them up there? When Musk sends people into orbit he doesn't do it as a corporate venture but as a government subcontractor. If NASA doesn't pay him he doesn't launch any astronauts, simple.
Personally I don't think manned spaceflight has any future beyond what it is now.
As somebody once said, the great thing about being a pessimist is that you're never disappointed.