I've been relentlessly following the auto industry the last 10 years or so and I can't tell you how many times I've heard rumors of a cherished model coming back from the dead, only to be disappointed. Or in other instances it's some sort of new IP usually performance related that gets teased and conceptualized.
Now sure some do successfully make the leap back to the land of the living (Camaro, Charger, Challenger, LFA, Toyoburu twins, and maybe soon the NSX) but most just wallow around in "it's being considered" purgatory.
So who's the best/worst at this? Here are a few examples I can think of off the top of my head: New RX-7, Supra, next gen Lancer Evolution, mid-engined Corvettes, El Caminos, rwd Ford/Lincolns, every Alfa Romeo (though the 4C did come through), a BMW supercar, Silvia successor, S2000 successor, and surely many more.