I don't think that even mag-lev rail launches off the side of the Rockies quite gets us down to under a million per launch. Amortizing the infrastructure, and re-proofing the man-rating of the space vehicle itself will chew up more than that. Sorry, your math just doesn't add up.
The problem isn't technology, and people dreaming up magical technology to throw at the problem simply show that they don't understand it.
The problem is economic. NASA has an extremely limited notion of what they want to do and what is possible because they don't understand markets. They spent thirty years chasing those nasty capitalists out of their territory before they finally started to get a glimmer of an understanding that they were limiting themselves as much as anyone else.
Space needs economies of scale and it will never get that from NASA.