“If there's a big fall in salaries, there's also going to be a big fall in property values.“

I don’t think so. Rents will go up and housing ownership will be concentrated even more on wealthy people and big companies.

The destruction of AirBnB may push rents down. Hard to see how rent can go up beyond what people can actually afford?

Rent, health care, education and housing cost can go up to a level that it eats up most income for average people. That seems to be the trend.

I don't know about the national level, but within major cities where tech salaries and Airbnb are both prominent, I'm curious to see what happens to the local real estate markets. I know many people in Austin and SF who can afford their home because they A. have a large salary working in tech and B. offset their mortgage by Airbnbing.