But so far, that hasn't really created a housing affordability crisis... yet. A lot of the impact has been mitigated by falling mortgage rates and rising wages. Let's just take Tampa, as one of the hotter housing markets. Since 2014, median listing prices have gone up 57%.[1] Adjusted for inflation[2], that's 49% real price growth.
But over the same period, average mortgage rates have fallen from 4.49% to 2.95%[3]. Meaning for the same house cost, the monthly payment on a 30-year fixed mortgage has fallen by 18%. In addition national median incomes have gone up over the period by 10.5%[4]. (And almost certainly more in Tampa specifically.)
Therefore housing affordability has only declined by about 14% for the median household in Tampa. All during an extremely hot housing market. Again, that's still indicative of some recent bad NIMBY policies. If housing supply was perfectly elastic, things like lower mortgage rates and higher wages would benefit consumers instead of inflating property prices.
But there's no indication that housing has become drastically more expensive in "flyover country". This conclusion can be spot checked by comparing national consumer expenditure surveys over time. The percent of after-tax income spent on shelter has actually slightly declined from 17.8% to 17.0% during the 2013-2019 period.[5]
[1] https://www.zillow.com/tampa-fl/home-values/ [2] https://www.bls.gov/data/inflation_calculator.htm [3] http://www.freddiemac.com/pmms/pmms30.html [4] https://fred.stlouisfed.org/series/MEHOINUSA672N [5] https://www.bls.gov/cex/2019/standard/multiyr.pdf