The next election will probably not change anything. We made a huge mistake jumping right into a national election without building up any kind of local or regional power structure, just like we made a mistake by destroying the existing political and military bureaucracy. Not sure why we did it, but now that the Shi'ites have power, they're not likely to share it—and with their numbers, they can command a majority in any democratic process. The Sunnis will either get used to being a mostly disenfranchised minority or they won't.
We could have thought this through much more thoroughly than we did, and since we fought the war entirely at our own initiative and on our own timetable, we had no excuse not to.