I read the other day that Portland (and Vancouver) are going to greatly reduce cycling budgets, as there has been no increase in cyclists commuting, despite huge expenditures.
Looking for that story . . . here is an older report:
http://www.oregonlive.com/commuting/...cycle_tra.html
I think ridership plateaued at 6% (still 10X the national average):
http://en.wikipedia.org/wiki/Cycling...rtland,_Oregon