@Jox
A very thoughtful and well constructed post. In fact I would venture that the post is well worth book-marking as a future reference.
As you have carefully pointed out, the technology is available, it has been proven, and the only things that are missing are sufficient infrastructure and industry willingness to make it viable in the short term. If the regulatory bodies were to make the first move, then the rest would fall into line when commercial reality becomes commercial necessity.
Unfortunately, it will be a bit like my planned trip to Mars - a long wait!
mm43