"Temperate" I'd agree on, but not "warm".
1. In the past 25 years there has been a huge re-migration back to cores of major cities. I think that is going to stop.
2. Suburbs and exurbs I think will become way more popular. The normal limiting factor on those locations is the commute, but I think so many more companies will be used to remote work after this (even if they don't necessarily prefer it) that you'll see a lot more "come into the office once or twice a week" type things that make living in the exurbs a lot more bearable.
3. I don't foresee migration away from the major metros. People will still go where the jobs are, and if anything I see the pandemic making strong companies stronger and smaller, weaker companies weaker. Definitely would not be willing to put a lot of money down on this 3rd point, though, could see a trend toward 2nd/3rd tier cities.