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Sort of both resolved and not resolved since I can't remember him coming back. It did give Frakes an opportunity to play a different character later on in DS9.

I liked that episode and would have enjoyed Thomas Riker showing up again from time to time. Although it was another one of those "why can't they just restore dead crew from the transporter beam?" episodes. Even worse than the Scotty one since doubling Riker means that Riker's matter didn't really matter much.

There was also Sim, in Enterprise, a clone of Trip who was then harvested for spare parts.

Stargate: SG-1 had robot doubles who were killed off.

Thomas Riker was mentioned again in the animated show Star Trek Below Decks, when one of the characters gets doubled by a transporter accident.