Change for change sake isn't necessarily a bad thing when it comes to making city bid like this.
Bidders get tired of submitting the same city again and again. Juries get tired of reviewing the same bid again and again. After a few times, whatever reasons they didn't select a city the last (few) time(s) is going to dominate over actual bid this time around.
Disclaimer: Not saying that necessarily applies here (yet)
We withdrew out bid for 2008, though, so it's not an issue this time. If we're not successful next time, it might be worth considering another city, but London is the best bet for 2009.