Well it happened to Commercial RE because of COVID, which was seemingly unthinkable. So now we want to convert some to residential. What other unthinkable fut

Well it happened to Commercial RE because of COVID, which was seemingly unthinkable. So now we want to convert some to residential. What other unthinkable future could lead to a change in net migration out of urban areas rather than into urban areas? Happened ~1950->1990s. Flipped 2000-2020s. Could flip back? Who knows!