It'd be something I'd be interested in. Logistically though as shared above it'd have to be somewhere quite easy to get to for the majority of people. It'd probably be stateside then!

I think probably the most viable will be a mutli-plugin based WordCamp, on the most popular plugins, or even just a "themed" WordCamp i.e. "WordPress for Communities" (which could incorporate bbPress & BuddyPress), "WordPress for Marketers" etc. etc.