Five thousand years of recorded history suggests that's a pipe dream. Such cultures only exist in fiction (that we know of). Utopia is often described as imaginary.
The imagination being entertained here is your own; that humanity's future from this point could be even remotely similar to anything that's ever happened before.
Every choice we make as a whole now is of extreme importance, and almost nothing we can conceive of can be sensibly considered to be off the table.