The effect will be basically to add an extra 65,000 workers to the tech labor force available in big tech cities.
Speaking as a tech worker in Silicon Valley, I don't care. Everybody who works in tech here makes enough; indeed, one of the reasons why the cost-of-living is so high is because there's broad-based prosperity among techies that drives up the cost of basic necessities like housing. If tech salaries fell, that would actually put less pressure on the non-tech population here, who are the ones who are really hurting.
It'd be far less disruptive than the current system, which puts that pressure on software engineers working for big companies in say, Minneapolis, where the average software engineer salary isn't much more than the general population.