You've clearly not played EVE Online. This sounds like a joke, but it's probably the closest thing out there to an example of what the future will be like if mining of asteroids becomes insanely lucrative (and technology advances fast enough for us to even witness it).

Someone who's played EVE for a significant amount of time (it's been years since I've touched any game) could probably answer everything above.

This is all to say that we'll of course fight over it.