That's an absolutely great idea. Off hand, San Francisco needs at least two, Quebec needs one, so does Oregon City, Oregon. Oregon City already has a public elevator from the lowest level of old downtown up to the 2nd level, but there are two more really steep stretches before you get to the top - the Molalla Ave hill is a maneater on a bike - it is at least as steep as the slope in that video and twice as long.. For all of that, it is the least steep of any of the roads down off the top.
I know, I've ridden all over that town in years past. If I were in SW Portland today and had to get to Mulino or Molalla by bike, I'd go 20 miles out of the way through Canby before I'd tackle that hill.