We are steelmanning the Utopian here, so maybe it is best to leave off the space wars for the moment.
However, they might change very little since our AI robots would fight them, and we can replicator print those.
Assuming very cheap FTL/instant travel, humanity could expand nearly infinitely.
I think real estate will become the dominant market in that scenario as people flee the rest of humanity.
Still, a space trailer park is a hilarious idea.
