I agree with you to a point. Infrequent wine drinkers who want a casual option generally prefer a lighter, sweeter or more fruity wine. These people truly didn't like cabernet (too bitter for many), but they wanted to be "with it" and merlot was the hotness, so it became a go to. As the article I linked above mentioned, for these people pinot noir was always a better choice, but the hotness of merlot (at the time pinot was oft considered a dessert wine) made it socially less of a norm. Sideways, and people just generally discovering that there were other options, made it an easier social choice for many, and pinot noir was on fire.

As an aside, while I absolutely agree that most wine snobbiness is absolute horseshit (there is loads of it throughout the discussion in various other threads), that study on wine "experts" who couldn't tell the difference between red and wine is just terrible nonsense. It was some students who were recruited and smelled wines, given the visual cues of color.