This is gonna be interesting ...
Deleting the Special Faded stuff is a severe mistake in my view. It gave smaller budgets a chance to get acquainted with the brand and I for one liked the Special Faded look. There is nothing less important on a guitar than the fin (from a musical aspect).
Mark, if you donate that special faded vintage relic kidney ("roadworn") to Henry J, he might give the 2015 TBird some chrome and you might get a chance to soil your panties!
In recent years, there has been a plethora of different Gibson bass models and spin-offs, but there was no visible concept in marketing them. Not one of those basses made it to a test in German guitar and bass mags (while hardly a month goes by where there is not the umpteenth LP or SG guitar variation being tested). That is the real issue with Gibson basses.
I doubt that we will see the end of the TBird or the SG Bass though, they are both consistent sellers and flagship models due to the history attached to them. If you asked anyone to draw a Gibson bass from memory, they will most likely either draw a Thunderbird or something EBish/SGish. But all the other models I'm not sure whether they will survive. The EB might, it is still relatively new, unless sales have been horrible.
I'm not entirely surprised, the frenzy of new Gibson bass model releases in recent years seemed wanton and desperate to me (if welcome from a collector's viewpoint - btw, none of them was a bad bass). Niche releases of Flying Vs, Explorers, RDs, EB 335/Midtown Basses and Rippers/Grabbers/G-3s cannot give Gibson sustainable bass sales.