Here's how that would work: anyone who doesn't vote automatically gives their vote to the non-voting party. The non-voting party gets allocated seats and victories just as any candidate would. But they always vote for no change to current stand when it comes to every issue. These seatholders could be monkeys, for all I care, with lots of bananas given their exuberant salaries.
Yes, it is extremely counterproductive. But it would force political parties to become more relevant and work on ways to avoid getting the monkeys voted into office instead – and that means fixing the issues that are turning voters into non-voters, as well as an incentive to fix broken policy instead of introduce more broken policy.