I think it's still fairly useful. It provides an interesting framework for understanding Trump's tastes—or, maybe, the taste he projects in order to market spec

I think it's still fairly useful. It provides an interesting framework for understanding Trump's tastes—or, maybe, the taste he projects in order to market specifically to prole and middle (not upper-middle or higher) people who've moved into higher wealth brackets—for instance. I think it's also useful for understanding which class is being targeted by advertising—the class markers and attitudes it covers, and others that one might infer, are everywhere in advertising. His "Class X" stuff was way off, of course, and is another thing the trappings of which became just another class marker (for hipsters, in fact, and some other fashion/lifestyle movements). Probably that's a recurring cycle with countercultures. Some specifics have shifted, though trends and anxieties have not so much, I think. A lot of the visible wealth now is (as usual) new money—often tech folks—so I think it remains to be seen whether their kids and grandkids will retain "lower" (largely upper-middle) class tastes and behaviors or integrate fully into the upper classes.