I'd add to this that Mars also isn't the end, but rather the beginning. The moment the first human steps on Mars, we will already be thinking ever more outward to ever more exotic targets, perhaps Europa being next. The bigger picture is starting the process of putting humans into the cosmos - and so it's not just another planet full of resources, land, and unknown discoveries awaiting us - but an entire solar system, and on a longer time frame - an entire galaxy.
And I think once we start iterating on these concepts, the timelines might not be as long as might otherwise be expected. Forget the 777 - it's completely stupefying that we went from the Wright Flier to the SR-71 Blackbird [1] in 61 years. That beast is another product of the magic of the 60s - long-term sustained flight at Mach 3.2 - 2450+mph. London to New York in less than 2 hours. There really was something in the water in the US in the 60s.
And I think once we start iterating on these concepts, the timelines might not be as long as might otherwise be expected. Forget the 777 - it's completely stupefying that we went from the Wright Flier to the SR-71 Blackbird [1] in 61 years. That beast is another product of the magic of the 60s - long-term sustained flight at Mach 3.2 - 2450+mph. London to New York in less than 2 hours. There really was something in the water in the US in the 60s.
[1] - https://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird