New Delhi, May 18 -- Observers have repeatedly predicted the collapse of Israel's government over the past two and a half years. Indeed, many have wished for it. In the end, two ultra-Orthodox parties in the ruling coalition have prompted the moment of its own demise. The Knesset, Israel's parliament, is expected to vote on May 20th to dissolve itself. That would start the countdown to an election in September or October. Benjamin Netanyahu, the prime minister, may still try to stymie the vote. But at best he can buy his government a few more weeks. This Knesset's term is about to expire; parliamentary elections must be held by October 27th at the latest.

The immediate trigger is a demand by the ultra-Orthodox parties for a law exempting...