Doing away with parking (or free parking) is a staple of cycling advocates -- it's one of many measures designed to remind people just how impractical their cars are (by explicitly decreasing their practicality) and they really should be on a bike.

Of course, if you were to suggest that bicycle parking should be charged for similarly (or even charged less but still charged, as bikes do take up less space to park), they'll generally come unhinged.