There are smart ways to do high-density housing while preserving the character of cities like Boulder. The rail line from Denver to Boulder is going to help a lot of people justify not having cars in Boulder, and traffic congestion is probably the most harmful effect of squeezing lots of people into a small space. There are lots of places east of downtown/CU that you could build clusters of high-density, 4-5 story, mixed-use residential that wouldn't obstruct mountain views for the most powerful (i.e. richest) homeowners in Boulder. It would look ugly if you did something like the Denver Tech Center where 15-25 story buildings are placed on a ridge on the plains with no trees, but you could conceal quite a bit with the right placement of native trees around smaller 4-5 story buildings.