If you had been alive in 1492, you would have warned Christopher Columbus not to sail off into the ocean blue because the world is flat and he would fall off.
Personally, I think the only humans that will ever set foot on Mars will be the rich vacationers that can afford to go there - after robots build the facility.
We won’t live long enough to see it, but I suspect Mars and beyond will not be simply a destination for rich vacationers.