True I suppose, and it's not like we're on the verge of any new energy density tech that would make personal VTOLs viable either so runways might be the bottlen

True I suppose, and it's not like we're on the verge of any new energy density tech that would make personal VTOLs viable either so runways might be the bottleneck that keeps throughput constrained for the foreseeable future I guess. Although you can always build more of them :)