It doesn't look like Jaafari and his party will be in power after the December elections; his rule has not been particularly popular and his coalition is splitting. Remember, Iraq really is a democracy now, with real elections, raucous dissent, and a thriving free press. Bloggers and newspapers are reporting many Iraqis are very unhappy with the sectarianism of the current parties and secularists are expected to make big gains -- including a big chunk of Sunnis who didn't vote last time.
The current gov't just isn't very representative of what Iraqis want. They were elected because they were all Iraq had to offer last year. This year, there will be real campaigns, real debates, and real choices about the future of Iraq.
UPDATE: It occurs to me the upcoming Iraqi election is arguably more important than the last. The sad history of nascent democracies has too often gone the road marked "one man, one vote, one time." An orderly, peaceful, democratic transfer of power, something we very much take for granted in the West, is quite a novelty for an Arab country. Also, unlike the last election this one shows every sign of being much more than a vote by ethnicity or region; the real divide is shaping up as secularism vs. sectarianism.
For the first time, the will of the people matters.