Just looking at the temperature range on Mars. It's 1.5x the distance from the sun as earth and the surface temp ranges from a balmy 70F to -225F.
Elon specifically has this dream of colonizing mars, but it seems unrealistic. Perhaps in the future there could be an outpost where humans can visit for extended periods of time, but living there forever seems kind of sucky.
People are selling a dream. Simple as that. No serious person thinks it is on the verge of happening.
Just as Leonardo Divinci believed one day technology would allow flying through the air. It wouldn't be in his lifetime though.
LOL. Ok fed.