Read my opening posts about Elon's ideas at the top of this thread.
Elon's ideas have in most part been entirely unrealistic - some sort of Mars colony is fucking stupid - not stupid in the sense that it'll never work within the next 10 years - or ridiculously stupid in that it won't work within the next 50 years - or not stupid in the sense that we're at least a century out from a Mars colony... no, not any of these.
Fucking stupid in that maybe - just maybe - if mankind hasn't killed itself off by then - maybe in 200+ years a Mars colony is realized. Even so, that timeframe seems very doubtful.