1. Pecuniary externalities: these are second-order impacts on someone because of economic transactions that two people willingly engage in. We usually don't care about others' feelings toward mutually beneficial exchange. Tourism/housing/accomodation doesn't seem to be different here. Pecuniary externalities are not a thing anybody should care about.
2. It matters whether we're in small-town, low-competition places like I'm in right now (it's not like tenants are lining up for this house; and if there weren't an airbnb service here, the owners would probably just use it for occasional vacation or housing-market-savings account -- hashtag short the currency #994746) or downtown Barcelona. In the latter, still someone would be "priced out" -- whether by tourism or high-end immigration, by business offices -- and the blame would lay with the very obstacles that stop the price from falling to marginal cost (zoning + fiat money), not the exact facility that's taking place there.
3. What would have to be true for this to be the outcome? a) hotels either bankrupt, or on their way there because they're empty since the tourists now don't go there but stay in airbnbs, b) strict zoning would stop developers from expanding the supply in combination with increased demand, c) I guess, a ton more tourists that usually/in recent times.

Nobody has a right to live anywhere;