Maybe in a perfect world, but you have to be realistic, cars will never be outlawed, especially in America (and I'm not even American...)

We have dedicated bus lines on a large number of busy streets here in my city (Christchurch, New Zealand) and from a cyclists standpoint they work well. They are only in use by buses for a few hrs a day during peak time, and the rest of the time they are a nice wide cycle-way without any danger from traffic. Bus lanes are better than nothing from a cyclists POV. I dunno about LA bus drivers, but here most of the bus drivers are courteous, and it's a case of give & take, you give way to the buses and they in turn give way to you, it's synergy in action