I wouldn't go that far per se as far as training at one camp being over. I'd look at it more so as an evolution of the fight camp.
As the fighters skills are developing, so must the coaching. Every fighter is different and thus you must have coaching that understands and adapts to that. For example, lets go away from fighting and just look at S&C if your working with a local top level strength coach. Your going to see results. If you are working with say Poliquin, you are going to see amazing results. Because Poliquin has the skill level to adapt and improve from a variety of situations.
I have great love for Sityodtong, and I'm sure KenFlo's striking is as tight as it is because of Delagrotte. But, is it the best place for submission training, S%C, grappling, probably not. Doesn't mean it's a bad camp, or the idea of a solo camp is outdated. Just means that for guys looking to start future schools, camps, what have you; they need to be balanced in their approach and education so they can continue to improve their fighters.
Probably not going to happen tomorrow but give it time, evolution finds a way.