I don't think the preseason polls are that big of deal. Yes, the coaches poll still has a preseason poll, but the only other poll that counts (the Harris) doesn't start polling until 6 weeks into the season. By the end of the year both polls usually come close to getting it right.
I would much rather see college football go regional. Create a writers' and coaches' poll in the West (for Pac-10, WAC, and MWC), Midwest (Big 12, Big 10, and MAC), Southeast (ACC, SEC, Sun Belt) and the East (Big East, Independents, CUSA).
Take the top team from each region and put them in BCS bowls, and have a championship game a week later. Writers and coaches should only be accountable in rating teams in their region, teams that they actually see, instead of teams that are all the way across the country.