I don't think there's any going back to the old days.
Panerai used to be a niche manufacturer for a long time. Then came Hollywood and with it the move to larger watches. Now Hollywood moved to AP, PP and RM, among others, and we all are discovering smaller watches again. Panerai tried to hop on the wagon, but it's a failure equal to making a small HumVee. People were in awe with the Governator driving his monsters, but the mini Hummer is for posers. Blancpain discovered the same: everybody liked their 50 Fathoms and said "if they ever make it in 22mm . . . "
Well they did, and nobody is buying it. They don't because it's a mismatch. A HumVee is a big monster. A Panerai is a big watch. A 50 Fathoms is 45mm in diameter, and a G-Shock is big as well.
So what do we take from this?
If you have an older Rolex or ETA-powered Panerai, keep it or sell it. With a few exceptions, such as the Bronzo models, the rest of the bunch, especially those with the in-house movements, will find very little interest as time moves on.