Could we establish colonies on Mars now? What if instead of invading Iraq those trillions had been targeted at establishing a colony on Mars? If it were a one way trip it would be very doable. I doubt finding colonists would be a challenge.
Poondyke of Mars is one of the first handful of Science Fiction that I read. Instead of all the crap movies out there I don’t understand why more Heinlein has not been adapted. I relish the Philip K Dick adaptations but as an author Heinlein is better. I loved the first Starship Troopers, but like Poondyke it was one of his juvenile targeted novels, he has much better mature ones.