The blank ballot can be easily remedied by allowing the spoiling of ballots, or marking the vote in a way that doesn’t indicate any choice.

I think this is a reasonable and valuable method of expressing political opinion, especially as this form can be counted. It also ensures that it was a deliberate choice and not just apathy.

Along the same path as incentivising people to vote, perhaps it should be cities/voting areas that get punished somehow for low voter turnout.