I can see a replicator or holodeck being a feasible
Star Trek technology for the future (forget warp speed and transporters). I assume given the replicator that you can only replicate WHAT IS KNOWN, so forget about producing phasers, tricorders, holoemitters, etc. The holodeck would be tempting, but with the replicator you could fabricate precious gems and metals to become fabulously wealthy. Yeah, replicator
all the way.