The San Diego City Council has approved a $500 million buck expansion of the convention center. As this article notes, a significant concern is to keep the annual Comic-Con International in San Diego and not have it wander elsewhere after the current contract expires in 2015. The piece notes that Anaheim and Las Vegas are "beckoning" for the convention.
My understanding is that Vegas has done very little beckoning. Anaheim and Los Angeles have beckoned, as have some cities a bit farther off. Personally, I think Vegas and L.A. are ill-suited to host the event. We may find out on in March how suited Anaheim would be to it. The WonderCon in March is being held at the Anaheim Convention Center…and WonderCon is operated by the staff of Comic-Con International. (In case you missed early explanations, WonderCon is usually in San Francisco but this year, the Moscone Center up there is undergoing extensive renovations and could not offer WonderCon acceptable dates and facilities.)
I doubt that Comic-Con will move out of San Diego; not unless the city planners down there do something really, really stupid to drive it away. This expansion still has to be approved by a number of parties but assuming it goes through, it'll probably lock Comic-Con in for another 4-5 year pact. Fine with me. It's a great city and I like the idea that when we're there, we own it.