Realistically, I think this is going to be a very small niche industry even after it starts and for years following. I'll be a good while before even hundreds of commercial passengers travel in privately-operated spacecraft, let alone thousands. It will happen, and may become routine, but I'm not going to make specific predictions about the timeline because this is a very expensive, complex, and still dangerous endeavor, most likely with setbacks along the way.
I hope I'm wrong, though!