If you saw my earlier post, this fits right in with my predicted justification for why it is working: “No one drives on Willamette anymore. It’s too crowded.” I think there may be less traffic than say, in October, but the City is measuring that. Another perceptual aspect is that it may "feel" like less traffic because it's working.  What we had before was more like taking a group of soldiers and saying, "everyone through the canyon as fast as you can". Now, no one can speed by another motorist. 
As far as bikes, critics said that there were not bikes on Willamette, so why put in bike lanes. Then they said, if we put in bike lanes there would be too many bikes. So which is it?
I am sure more bikes will make things slow down. But then each bike is one less car, and each car takes up 7 times the space of a bike. 
It comes down to trade-offs. Shall we eliminate bikes, make it hard for pedestrians and continue 24 accidents a year because the current three-lane design has it's own problems?