That's a good exercise
But we need to start developing the technology necessary to reach other planetary systems. Reaching Mars is a good first step. But it's just that, a step. The objective should be to colonize other "Earths" beyond the solar system. The Sun will boil the oceans in 1 billion years. Living in Mars or the Moon won't be any kind of solution at that point either.
I propose that:
* By 2050 we should already have a base/colony in Mars
* By 2100 we should have a base/colony in some Jupiter's moon.
* By 3000 we should have been able to discover other habitable
worlds located in other planetary systems
* By 4000 we should have one or more colonies in those systems
