My general sense is that merging the vacation/short term rental market with the long term home rental market puts serious upward pressure on the latter, thereby increasing scarcity of opportunity for middle income people in urban locales.
IMO, anything that puts downward pressure on the derivative of social mobility over time is ultimately putting upward pressure on the shittiness of society as a whole and really makes life pretty unpleasant regardless of socioeconomic class.
I'll take an inefficient housing market any day over that.