This is happening in Venice and all over the world right now:
Airbnb and similar rental websites are about to force long term residents leaving the island. Already there is a huge problem for businesses to find staff since there is no houses left to rent anymore, and it will be much worse.
I know of more then 10 persons this year that had to leave the house they rent. An old lady who has rented for 27 years soon has to leave her job and the island because the landlord will make it into an airbnb.
Santorini is about to drown in tourists and I won't be here to see it happening...