Cops will whip a U-turn and pull people over for not dimming their brights. Just a matter of time for those idiots to get pulled over for it.
I've heard of such instances of that happening and the person takes it to court and merely points out in the handbook that if the low beams aren't working at the time you can legally use the high beams because there are no other safe alternatives and the citation (if there is one) will simply be dropped.