$50 is very small peanut to me.
Until a non-WP opposition party win a seat first if not everybody will talk until the cows come home too. In the next 20 years, we will still see 2 party debating in the House.
The smaller parties who suffer election defeat after defeat will soon be gone
I generally agree with you that with the current situation, it very difficult for non-WP parties to win unless there is a drastic change of mood and voters behavior along the way. If any non-WP party can win some seats together with WP, not only it open the doors for opposition co-operation in parliament, our political landscape will be heading towards and multi-party system. But if WP gains more inroad while others failed to win any, then it spell danger for the rest as WP will want to expand to other parts of the island if she ever hope to wrestle power from PAP.
The way I see, the future is rather bleak for non-WP opposition.