Is this really news? I live in an area where it rains pretty much the year round. Biking to work isn't impossible, merely challenging and unpleasant. I wonder if the uptick in biking to work is not because biking has become more popular but because there exists more circumstances (crowded downtown, difficulty with parking) where it's the only practical option.
On the other hand, the only factors keeping us from a huge uptick in working from home are (a) old school company policies, and (b) lack of broadband. And perversely, access to broadband is reportedly *less* likely downtown, (I believe there was a slashdot article on that last year) due to legacy wiring, (low speed dsl only) giving the edge for work-from-homers to the suburbs which are more likely to have cable or fiber. Suburb professionals also being the same class that are looking at a possible hellish auto commute and impractical logistics to bike into downtown, increasing the attraction of WFH.
I'd be interested in seeing the statistics broken out by distance from work, and perhaps split between jobs downtown and jobs in the suburbs. (For instance, the Intel plants -- major tech employer -- in this area are *not* downtown, but quite a bit out west of the city. So biking to work is more practical, but driving to work is more appealing also.)
I dunno, the more I think about it the more complicated the picture gets. I don't think percentage increases in commuting categories for all of America would necessarily lead to valid conclusions.
And incidentally, regarding the old school policies ("If you work from home, you work for someone else, not us") it's amusing how a company with strict rules *against* work from home will happily employ offshore programmers who (for all they know) are balancing an old laptop across their knees in a tin shack. But dammit, the locals they employ had better the hell have butts in cubicle seats first thing every morning.