I feel space exploration scould be supervised by United Earth/federation government then letting it get out of control.
The way human beings are, I have a hard time believing any government could stop them. Free enterprise will start making rockets, and away we go.
But maybe this concept fits in better with Firefly (and ENT) than with the more centralized-control mentality of TOS, where civilians don't challenge the supremacy of Starfleet very much.
The Boomers thing fit into something I wanted for ENT (and didn't see enough), the idea the the centrally-controlled, "evolved" Federation of TOS hadn't yet taken shape. I wanted ENT to show a more military Starfleet with more human foibles, and a lot of humans bopping around the galaxy unsupervised and basically being their usual uncontrollable selves.
Whether or not any of this should or will come to pass in reality is a different issue. I don't think governments and religion will "wither away" in the future either, but that's what Trek says, it's just a what-if basis for the story and that's fine. IF that were to happen, what would happen next.
I have a feeling real space exploration, if it ever became profitable, would be a lot more Firefly and a lot less Starfleet.
If it isn't under control it can easily lead to confrontation with ,,alien spices´´
Yeah we don't want war with the Cardamon Empire! Okay sorry I couldn't resist.
Starfleet riles up aliens plenty often of their own accord.

Might as well let colonists trespass on alien space, gets em used to the notion by the time Starfleet comes around.
Yknow now that I think of it, ENT did have the problem of Earth being blamed for human colonists' actions as a plot thread. That was good, it made for an interesting situation. The potential for conflict is a reason to adopt this aspect of Star Trek because drama procedes from conflict so why avoid it? Charge right into it!