A two way cycle track on Boylston would be AMAZING. They would just have to make sure to do it right, with dedicated bike signals. I'm suprized there hasn't been a stronger push for such devices recently.
I think MassMotorist point was in situations when there is no parked car on the right side and the biker still takes the whole lane scenario. It is not necessarily 2 lanes wide, but there is plenty of space to be on the right side safe and reasonably. That does happen and happen quite a bit.
There is always the potential for this:
And of course this:
I almost had a crushed water bottle kill me while braking one day because my front wheel locked up and skid on it... into traffic. BUTTTTTTT for the most part its just a biker being an idiot. I for one (especially the rare occasion I break the law and go the wrong way down a one-way) will coast with one pedal up over the curb to let traffic pass if need be as long as it is safe to do so.
As a side note, here are I believe the rules that should be followed when going the wrong way:
1) Only do so if the legal path is long, convoluted, or far more dangerous than the illegal route.
2) Only do so on lightly trafficked one-ways.
3) Ride on the RIGHT, and stay as close to the side as possible.
4) Slow and yield to everything. No one expects you to be coming the wrong way, remember that.
5) Never obstruct traffic. You're already breaking the law, don't block traffic to boot. Take the sidewalk if oncoming traffic seems to be nervous, or stop and wait.
Rant: I got into a screaming match with some spandex $2000 bike guy while driving the other day because he felt that being on the left side of a one way, making a left, and not stopping at the intersection was perfectly okay to do. Its the same as the assholes riding BMX bikes the wrong way in the bike lane down Harvard Ave, how does this ever occur to be a good idea to anyone?