Protected cycle tracks would be fine if they were remotely affordable, including the elaborate redesign of every intersection required to make left turns flow safely.
Here in PDX, there isn't the money for such facilities. We have one experimental protected cycle track for several blocks on Multnomah St, and people complain about its imperfections a lot more than they praise its virtues.
The standard mantra is that we need bike facilities that will be used by everyone from 8 y/o to 80 y/o and will convert all the "interested but concerned" people. I've gradually become convinced that many of those people are not really interested and their concerns will never be satisfied.