It depends what you mean by 'commercial' I suppose. If you mean you can pay for it if you have the money, then obviously now. Richard Branson is already offering it. But since even international jet travel is prohibitively expensive for probably 80 or 90% of people on the planet, I don't consider even that to have completely arrived commercially yet. So, probably never, apart from the most wealthy. And I consider us Westerners to be in that category. When your average Bangladeshi can save up and go to the moon for the price of a car, maybe then you could consider it 'commercial' in a meaningful worldwide sense.