With rights come responsibilities, is my view.
I see voting as a responsibility.
I mean, it is most unlikely to happen here, but can you imagine the news one day "People clearly don't want to vote so we will be having no more elections" 
No. You have a duty to vote.
I would like to see compulsary voting - with a box marked "abstain", so that if none of the candidates, you feel, deserve your vote, you can abstain. But you have to actively abstain.
Not turning up is ignoring the whole thing, is opting out of the process. That changes nothing. Anyone who thinks that politicians care if 50% of people don't bother voting or would ever say well, clearly people are telling us they don't like the system... well, they're nuts.
we've not had the AV referendum because politicians have realised the people aren't happy with the system, we've had it because it was part of the deal between cameron and clegg.
It would be interesting, as a first step, to add an 'abstain' box to the papers. To see if more people actually did turn up to vote if they had an abstain option. THAT would tell us if low turnouts are a protest or voter apathy.
I know which way I'd be betting.