I count three, the latter two of which are already doing more for less than most were expecting.
And this has all been clearly chosen as a development sequence that leads to them being a space trucking company, so those “decades” plural have already start.
But if it takes two more decades, so what? The points, pro and con, still stand. Technologically achievable, but no clear economic reason as yet.
I consider 30 years timeline as an optimistic scenario because we will have Super-Heavy rockets in operation in later half of 2020's, and from there onward the priorities for most major space agencies for manned spaceflight is return to the moon and in-situ resources. Which I believe should have been the focus for a while.
Most of innovation and commercial activity will be focused around lunar habitation and infrastructure, by the looks of it.
Even if money falls from the sky tomorrow this kind of stuff takes decades no matter who is doing it, spaceX or NASA.