Here’s a few of mine:
What if, ten years ago, Lotus decided to resurrect the Esprit instead of abandoning it?
What if, in 2013, Jaguar chose to put the C-X75 into production - but with a non-hybrid powertrain, preferably their supercharged V8, and a manual gearbox?
What if Chrysler’s 2004 300C had flopped in the marketplace?
What if the SN197 Ford Mustang had been given an independent rear suspension across the entire range?
I have many more, but I’ll start off with these four.