I'm perplexed. I've never understood buying a car as a "gap filler". Either it's the car you want, or it's not. Nothing in between. But that's just me. I will never buy a car unless I'm confident it's the car I want and a car I can live with. Probably why I keep them seemingly forever. I don't "settle" for a car I'm not happy with. If people love GTO's and they buy them because that's the car they want and desire, more power to them.
IMO, GTO's are a stop gap measure in semi-affordable GM RWD performance for those people that desire gap fillers.
If you want to go spend money to "tide you over", why not buy a decent 4th gen Camaro or older Corvette? They're a heckuva lot better choices than an "excuse" car like the GTO...but this is only my opinion. Performance-wise, I suppose they're ok. But if it didn't look so much like a jellybean it may not be so bad. There's something...no, a LOT lacking in the GTO styling that just doesn't scream to me "I will bring you joy in owning me, take me home and put me in your garage!"