Standardization seems like a good idea but I'm not sure if I'm ok with the government forcing a single standard. Maybe another idea would be to tax non-compliant chargers, so they could still be legal, but have an incentive to comply to the standard. Or remove patents on chargers so there isn't any incentive to force consumers to buy your brand of charger, you might as well just comply with the standard. Or allow permits for non-compliant chargers if they can give a good justification for doing it.