Teams of all 23 year-olds are fun for calendar shoots but traditionally don't have a ton of success.
Ricky is perfect for this team. He's barely on the wrong side of 30 and his effectiveness doesn't depend on his athleticism. He actually seems to be getting better in his 30s and I'd bet he'll be able to maintain this level of play (overall, not specifically tonight) for another 5 to 6 years easily.
OBVIOUSLY the big caveat is that he has to have interest in sticking around. If he doesn't, there's nothing to discuss. But if there is interest, I'd 100% without question rather have 3 to 5 more years of 30-something Ricky Rubio acting as a coach on the court and shepherding over this flock compared to another defensive specialist SG who makes Okoro look like Michael fucking Redd on offense just because he "fits our timeline" better.
It's not even a question.
Obviously, again, you have to talk to Rubio and see what he wants. If he's set on moving on after this season, sure, trade him for a piece that fits if you can.