> I’m pretty skeptical that almost any “race to the bottom” scenarios are easily attributed to consumer behavior
I'm not.
Most consumers are fickle, irrational, and often price-sensitive. They buy the $20 blender from Walmart that has a motor that will release the blue smoke in 6 months rather than the $50 blender that will last 5 years of frequent usage. Sometimes this is because of the whole "being poor is expensive" thing, but many times it's not.
> except perhaps in cases of commoditization where consumers reject attempts to differentiate products based on things like branding.
I think this applies to airlines.
I roll my eyes when someone says "I will never fly Delta/United/Alaska/etc again" because if you joined in every person's boycott because of one or two bad experiences they had, you'd never fly. They all will have delays, cancellations, and lost luggage.
I have absolutely zero loyalty or avoidance to any airline. I just go to Google Flights and pick who has the cheapest itinerary that doesn't suck too bad.