Couldn't believe my ears when I heard a news story about some town that was issuing citations for people who were "using" their cell phone while crossing the street--even if entirely legally, in a crosswalk and waiting for crossing signals.
Generally I would agree with the "natural selection" sentiment, until you're presented with an extreme albeit realistic situation where a distracted pedestrian mindlessly walks into moving traffic where a non-distracted driver swerves out of the way into some other traffic or perhaps another pedestrian, or causes some other horrific accident whilst the distracted pedestrian is ultimately fine and dandy.
I disagree with the legislation we've heard about so-far, but I would also err on the side of proactive measures rather than reactive measures, and I'd be pretty pissed if a loved one were the collateral damage in the above hypothetical situation. On the other hand, I wholeheartedly DISagree with issuing tickets just because someone is walking around looking at your phone. We're a technologically and socially-integrated society. You can't issue laws directly contradicting the general and accepted way of life and expect anything good to come of it.