Those are great chops, but if the Firebird ever comes back, it needs to be more than just a re-badged Camaro. I mean the cars will have to look substntially different and not just new body panels.
Keep an eye out for the next GTO that will be built off Camaro's chassis (ZETA). All the Zeta cars are supposed to be very different from one another. It will give us an idea for what is possible.
For Camaro, the 1st gen embodies what the car is. For Firebird, I'm not sure that is true. I think the Bandit era really is what Firebird is at its soul. So if I had to pick I'd say draw cues from the '77, though maybe not as literally as the one above. Giant bird decals aren't going to help sales (or the car's image).