They'll be back...I think
(I have no idea). If they do return, it won't be on this body style, though. The thing is, that this car wasn't designed for the implementation of T-Tops. Maybe if people yell loud enough, the next significantly changed model year will be.
You're right though, T-Tops had almost become a Camaro/firebird exclusive. I'd honstly rather have the full removable roof panel - but that's neither here nor there.