Pay people to serve in a real life version of Starfleet?
Go away for a some number of years and when you come back, you're guaranteed whatever luxury income for life. Space is risky now and will be for quite some time so maybe have it like 5 years for full retirement.
Maybe the ability to have children will be shut off by default from birth by some genetic engineering thing and switched on via some other means after passing a kind of character credit check that's easier to pass if you served in this hypothectical "Starfleet" due to the nature of it.
Today, not everybody gets to be an Astronaut. Tomorrow, not everybody gets to be a parent.
Eventually, maybe Earth will only be home to those who don't have "the right stuff" for space travel and they can live as they please.
The Homo genus eventually gains a new species. Homo Stellaris?