How many space telescopes better than anything we currently have can we put up when launch costs are <$50m?
A huge synthetic telescope in orbit with an aperture the size of the planet?
How many private earth observation satellites?
The market is huge when weight constraints largely go away and $/kg drops so hard.
The question is whether those markets are not already adequately served by Falcon 9. Once again, just because you have a jumbo jet that can fly 500 people from New York to London does not mean that everyone flying out of New York wants to go to London, and it doesn't mean that it's worth flying that jumbo jet from New York to Pierre, South Dakota with only one passenger on board.