Re: Musk really does see himself as the Saviour of Mankind
> The logical way forwards seems to be to build a base/assembly point at one of the Lagrange points (L4 or L5 are the obvious choices) followed by a moon base
No, the reason Mars is the place to be is it can be self-sufficient. L5/Moon bases will always need a continuous resupply. There's very little on the Moon to exploit for resources, and nothing at all at L5.
> to make it self sufficent takes lots of mass
No, to make it self sufficent takes resources in-place. Mars has stuff we can refine. L5/Moon does not.