Fair, but even if it were extremely efficiently run, even the fuel costs of lifting large masses into orbit and the associated size of the vehicles required, as

Fair, but even if it were extremely efficiently run, even the fuel costs of lifting large masses into orbit and the associated size of the vehicles required, as well as the resultant complexity of such a thing would be prohibitively expensive. Much cheaper, but still not where it needs to be. In order to do anything serious in space, it needs to become MUCH CHEAPER to put things into orbit. That is what a space elevator could accomplish. Not to say that we're ready technologically... we need to become a whole lot better at producing long carbon nanotubes.