The problem is that Denver has too low a population density combined with the fact that owning and operating a car is too cheap, easy and flexible.

Cars are too cheap because we subsidize them too much, in terms of roads, parking lots and so on. It still strikes me as crazy that >$1B in land value (back of the envelope calculation) of Manhattan is dedicated to FREE street parking.

Likewise in most places population density is too low as a consequence of just how much land there is and as a matter of policy. It's crazy to me that in a city like Atlanta (for example) you can get 1-2 acre lots.