A big part has been life stage changes, but also I think there's been a decline in safety in many major cities, such that I just don't want to risk the crap-shoot of an Airbnb any more. Hotels are not perfect, but it's a known product compared to Airbnb listings.
Instead in professional airbnbs, there's a race to the bottom with extremely bad mattresses, uncomfortable beds, heaters that don't work to save money.