Honestly? I'd like to see Chevy/Cadillac/Pontiac
And I'd like them to be set up like Toyota/Lexus/Scion, and Ford/Lincoln/Mercury.
Universal/Luxury/tuner-sporty
None of GM's other bands seem to match as close as these three do, imo.
But bottom line? Chevrolet and Cadillac are absolutely MUST-STAYs.