A subtropical mini-Manhattan with glistening steel and glass towers. An outsized “American Dubai,” where foreign zillionaires keep dumping money into ever more outrageous luxury real estate. A flooded wreck overtaken by the unforgiving certainty of sea level rise.

Ask people what the Miami area will look like in the future, and those are some of the more far-out possibilities. Add to those the predictions of Christopher Leinberger, a George Washington University business professor, real estate developer and land use expert for various Washington think tanks. He thinks Miami, against all odds, has the potential to be “walkable.”