We probably don't have enough people in the area of SoCal to have one. If we were to have one in the states, there might have to be two. One for the east coast, one for the west coast. But still, even so, we'd be alienating our midwest and southern members(like myself).
Places like Chicago and Las Vegas come to mind, but they are stll pretty far from other major population centers. The most logical thing to do would be to make three. East, West, and Central/South.
The thing about doing an Escapism in the US, is that we have such a huge landmass that US members span across. It's not like the UK where it's an island nation with most of the population centers are all fairly close together. Or like in australia where a lot of the population is concentrated in one smaller area.
Honestly, in order for an Escapism trip to happen in the US... It would take some serious planning and possible sponsorship.