Parked your coupe next to a current 3-series lately? That's what safety standards and broadening backsides have done to cars in the past 50 years. Yes, the coupe is extraordinarily beautiful, but many of the things that make it so could pass neither current standards, nor buyer expectations. Love the delicate roof pillars, and the complete lack of a b-pillar? Try to get that past current rollover standards. Clamshell hood? Outlawed by tendency to guillotine drivers. Graceful tiered dash (airbag-free, as is lovely three-spoke metal and leather steering wheel). Light and narrow doors lacking crash structure or airbags? Think diving board bumpers are clunky? Try meeting todays standards for crush zones and pedestrian safety. Then add the electronic and comfort accessories that are now expected, such as ABS, stability and traction control, entertainment and nav systems, effective air conditioning and defrosting, heated and powered seats and bluetooth and radar cruise and, and, and...
Better to preserve and enjoy our cars for what they are, the high water mark for grace and beauty in a coupe, but also a product of the time in which they were built; a time to which we can never return.