Here's some to get started, and I'm sure people have better:* virtual work will migrate down the food chain of jobs, making internet/visual hookups more like a utility and possible differentiator for residential landlords*rental/business interruption insurance will evolve..more expensive and more comprehensive?

However, in general the demographic that is making that migration are also the eat local population too. 

Here are the four statistics you'll want to consider when researching prospective markets:1) Job Growth2) Population Growth3) Migration4) Housing MarketAnd here are some relevant articles about Phoenix to save you some time:-- Phoenix leads US Counties in Job Growth, New Data Shows-- Phoenix leads the US in Population Growth, New Census Data Shows-- Phoenix is the #1 Migration Destination-- Phoenix is Expected to be Among the Top 5 Housing Markets in 2020I can practically guarantee none of the other markets you're considering are going to be as strong on all factors as the Phoenix metro area is.

What is getting ready to happen when this is over is it will result in more of a mass migration unfortunately with these people moving to the South where they will try to come with their ideas about rent control.   

Vapors migrate from a contaminated source and you need to ascertain that the source of the contamination is confined to your property. vapors can migrate over significant distances especially if they get into sewers.

Some types of contamination does not migrate.

Once you start analyzing P&L or cash flow and start making recommendations on that the conversation starts to migrate from an agent to one of financial advisor.

Houston remains on the lower end compared to other major cities with a median home price between $175-223K and Median rent between $995-1500In the Top 10% for cities with the highest appreciation in the US. depending on what area between 4.42-7.21% (Houston) vs 3.37% (USA)As of 2018 Houston is #14 for cities with fastest growth and migration from other US citiesAs of 2019 Houston is #30 out of 125 cities for best places to live in the US Sources: neighborhoodscout.comrealestate.usnews.comrealwealthnetwork.comhar.comWallethub.comcensus.gov

From Mesa and Scottsdale in Arizona, to Jacksonville and Sarasota in Florida, these four cities had 50% more people moving in than moving out.To read HireAHelper’s full study examining US moving trends, visit: https://www.hireahelper.com/moving-statistics/migration-report/ .

It really seems to be a combination of taxes, weather and family that influence the migration patterns to the Carolinas, Florida, Arizona.