I wonder if what happened was the RV manufacturers got some feedback but they misinterpreted it.
Until recently, they were making a lot of RVs with white or almost-white couches. For camping, that is crazy, IMO.
But that doesn't mean we want EVERYTHING dark!
Speaking as a 'young' rv'er, what I want is dark furniture and floors, light, washable, walls and cabinets.
And I prefer real colors over neutrals, I hate woodgrain, and I hate grey or black, especially with red accents.
I like the vintage/diner style a lot, but it makes me a bit sad that people have to copy something old because they can't make something new that is pleasing to look at.