Popular Mechanics has rounded up some thoughts from some panel members, and others, including John Carmack. I haven’t had time to read them yet, myself, but may have more comments when I have.
[Update a few minutes later]
OK, I’ve skimmed them. Bob Park has nothing of interest to say, as usual. I think that Scott’s comment is the most interesting. I think that the answer to both questions is yes. We already can see the economic justification — if nothing else, there is a market for wealthy people who simply want to go. If the price can be brought down, that market is extremely elastic (look what happened to the cruise industry…). The way to bring the cost down is to build an affordable infrastructure, and start living off the land. The great tragedy of human spaceflight is that we have squandered tens of billions over the past decades redoing the unaffordable Apollo model of centralized bureaucracy. Had we not been diverted by the need to beat the Soviets to the moon half a century ago, I think that a NACA that had evolved into a technology agency for space as well as aviation might have had us much further down that road by now.