I wonder if he is a believer in the technological singularity.
I suspect he probably doesn't spend to much time thinking about what would be cool if other people did something. He may consider it idly once in a while, but I would be surprised if he considers it seriously while also not involving himself in it.
Obviously you'd have to ask him though.
The funny thing is that colonization of Mars is not something that will happen without the latter group. There is currently no economic sense in going there, which bars it from happening on its own.