IF I were in the new regime at Gibson:
Re-Issue the Ripper. To my mind, the closest they ever came to a mainstream bass that would compete honestly with the rest of the market. Traditional EB's are married to that tone, and T-Birds often struggle with neck dive. Contact Seymour, use his Ripper pickups, use the HipShot replacement Gibson bridge and update the rotary switch functions. The re-issue they attempted some years back was still-born alongside the originals.
A subtle fine-tuning of the Thunderbird (puh-leeze go to UltraLight keys !) by smart engineers would cure the neck dive. Offer them with Nordstrand passives or let Lindy Fralin take a whack at updated pickups. It's iconic, but just needs a little careful fine-tuning to really make it a useful alternative. Do NOT give up the neckthru construction, and add the Hipshot bridge.
A new version of the Victory Bass: Easier as they weren't as iconic as their other offerings. Take about a 1/2" out of an often heavy body, streamline the slightly-too-big headstock, and work with EMG or Bart for replacement pickups and tone network, and keep that slanted neck pickup, a visual landmark for these. Make this a sophisticated choice, in various woods.
And finally, what with the selling-like-hotcakes Jack Cassady's, a real, ES-based long scale bass, fretted and fretless, within the genuine Gibson line.
Despite my frequent snipes ('Gibson Bass is an oxymoron like jumbo shrimp or government intelligence') with a little careful development and input from accomplished players, the roots are there. They just need to go to finishing school. Gibson basses always seemed to me the way bass guitars in the early days were also-ran, extra income products made by a guitar company. Ease them into a product identity where they finally feel and look like basses built by a bass company, they might laugh all the way to the bank.
Stranger things . . . . . have happened.