A space plane would be pretty cool. The complexity of such an engine might be a lot to deal with though. I’m curious to see how it goes. I hope SpaceX gets more people trying to develop their own cheap space transport (which I hope comes from a wide variety of ideas).
The increase in capital and the increase in the market would be pretty awesome and would drive development.
I wish we could scrap SLS, double NASA’s budget, audit NASA to streamline it financially/bureaucratically and put NASA’s goal as assisting humans in landing on Mars and developing the first exploration missions to outside the solar system. NASA needs to be cool again. NASA shouldn’t be a conservative organization in the sense of the word that means reserved.
With BFR, NASA should be thinking about selling the space station, and then producing a craft meant to traverse the outer reaches of the solar system. I don’t see why BFR couldn’t go along with a large space tug. That is, you dock the BFR on the space tug with much more living space. Some project of that magnitude should replace SLS and, given SpaceX’s track record, public funds should be used to accelerate - and guarantee a BFR launch. A contract with an aggressive deadline that gives SpaceX freedom to do it how they would like to, and places NASA’s plans in SpaceX.
Then there would be more rocket engineers on the market to go help companies doing good stuff, or we might get other space startups. Really, killing SLS and diverting those resources would do a lot of good.
Furthermore, NASA’s budget is about to get a lot more return on investment with BFR.