The article with that image missed the point, as does the concept.
Dodge has been selling the crap out of the challenger. Since 2015 they sell 60k, 70k units a year.
The reason why cars like the GTO flopped, and why that buick would flop, is because they stick too close to just a little decoration around the edges of a blah product.
2 door coupe sales are down because the offerings suck. When you sell subcompact econocrap people don't want to drive with their chin in their knees.
The other extreme is putting a 65k Cadillac/BMW/Merc out. Even the cheap mercs have that godawful snub nose and hatch/trunk hybrid without a deck
Where's the 20-something thousand, roomy, coupe outside the challenger
Now, when you build a BIG roomy reasonably priced car like the challenger, that doesn't look like it was punched in the nose with a crappy design, they sell.