I can't help it, I'm a child of the Seventies. If I ran General Motors, I would command them to resurrect Oldsmobile and sell slightly modernized versions of the 1976 and 1978 Ninety-Eights in parallel - two great cars, go great together!. Every time I see a '79 Eldo Biarritz with the stainless steel top, I get goosebumps. And I tried to get the Euro-market velour interior in our last 330i.
When the 300C Coupe comes out it should have a vinyl top option. I bet you a lot of people would take it up. There's ample precendent to put a vinyl roof on a sporting full-sized coupe, the XJ6C and XJ12C not being the least impressive among that precedent.