Jon Rosenberg (of goats.com)'s experiment with this in the early 2000s -- not bitcoin, which didn't exist yet, but micropayments in general -- was the first one I saw with hard numbers about why this will be extremely difficult. Sadly, he's taken his site offline, but short version: There's a huge difference in someone's mind between "free", and "not free"; it's seen as a change in category, not in degree. Having to commit any amount of money - even $1 - significantly reduces your audience, but once someone's gotten over the hump of willing to pay, you might as well ask them to make a larger purchase of a T-Shirt or subscription.
This sort of experiment has been repeated many times. Folks like Flattr have tried to tie this to social networks, so it's seamless; and the NYTimes model of metered paywalls (smaller publishers can use something like http://www.tinypass.com/, which Andrew Sullivan's blog uses) seems to be taking over magazine publishing. Even attempts to turn cable subscriptions a la carte aren't doing well, as Megan McArdle explains: http://www.theatlantic.com/business/archive/2011/06/why-cant...
I get why the Genesis Block would have enthusiasm for this idea. But one-pass micropayments, Bitcoin or otherwise, don't seem like the future to me.