[chassis]

The GLB is what the GLA and GLC should be. The GLB is reasonably spacious and offers a third row. The GLA is too small and crappy looking and not worthy of the three pointed star. The GLC is the odd man out here because it is a tad large and pricey for the segment. The GLC however offers a more luxurious interior than the GLB, so this must be the point of distinction. A GLB with equal luxury as the GLC would make the GLC redundant. The GLB, made in Mexico, seems to be capable of being gussied up and a good profit maker for Daimler in North America.

AMG C63 coupe is a hot rod, I see this staying in the lineup.

The coupe proliferation may have been an attempt to access a younger market than where the SL market evolved (elevated age). A two door vehicle is impractical for most people. Exceptions are sports/enthusiast types and no-kids types. Even people with no kids who have business activities have limited or no use for a two door as a daily driver.

Another German coupe that I don’t understand is the VW CC. No rear headroom. What is the why? for this model?

The SUV comments on this thread are mainly from North American points of view. In Europe the sedan is alive and well, so there are consumers and markets in the world where price, tax and operating cost favor preserve sedan attractiveness.