But I am not so sure, if they will be also so happy on mars, if they really have to be underground allmost the whole time and teleoperate the robotic exploration and mining on the surface etc.
For me the dark winter already is every year challenging. But being in a dark winter so to say forever, would not be bearable for me.
Similarly if some caves are street sized, being there would not feel like being underground. Add to that better vr, and ability to jump really high due to low gravity and living in martian cave will be almost better than living in many cities here on earth (of course this is assuming 0.3g is high enough to prevent adverse effects astronauts see in 0g).
But the first pioneers will be probably cave dwellers or will die of cancer after a few years. Which is probably exepteble for quite some people, if they get those pioneer years instead...
The problem with the winter that you stuck in your "small" house. If you create Cosco sized "open" space underground it won't be a problem for most of the people.
And yes, I also meant the space problem. Open space underground might solve it for some people, but probably not for me. I would always feel like in a prison, if I cannot go outside and feel real wind. But humans are adoptable. Still, I suspect quite many, who think they want that, would probably go crazy, if they really would be stuck in a bunker forever.
That's okay for many people knowing they are in the forefront of humanity's interplanetary expansion. Also, probably whatever they do will enter the history books as epic heroic acts.