The downside of building up, up, up? More stairs than you ever imagined, not to mention the potential problem with elevators:
A mile-high skyscraper, for example, is possible with modern design techniques and some small projected advances in building material. But the elevator to the top would have to be a speed demon in order to make the trip in a useful time frame. Remember, it has to go a full mile. At 10 mph, it would take six minutes. Not so long, perhaps, but I’m going to bet not many people are keen on the idea of standing in an elevator for six minutes. If the elevator ran at 20 mph, then it would make the base-to-summit trip in about three minutes, and according to the infallible internet, most elevators in tall buildings run about 22 mph with slowdowns as they approach the destination floor.
Given the general reaction of people stuck at 10 mph horizontally — I-35 south provides numerous examples of same every workday — I suspect they will not like it much going vertically.
For myself, I don’t get seriously claustrophobic — Trini can verify this — for about the first thirty stories. Anything much above that, though, and I expect the subconscious to dig up something primal and wave it in my face, with results no one wants to observe. Especially me.
And you know, “Approximately Six Devons” might have been a good Bob Dylan title, circa Bringing It All Back Home.