The climate part is certainly an issue for dfw, but the superiority of dense urban areas from a financial or ecological standpoint isn't backed by data. Buses were better for fuel efficiency, but now the bus and robotaxi are both ev, the robotaxi has a smaller impact ecologically due to microplastics scaling with axle weight ^4 and financially because road wear scales with axle weight ^3. If buses and trash trucks didn't drive on streets they would last virtually forever the way they are built now. While the glorious excesses of the last 75yrs are definitely going away, the suburbs may very well not. Urban cores might instead rot in infrastructure until only the highways between them with low density adjacent settlements remain.