In addition to the people from the MK there were many families who would get off the bus with their beach bags for the day from the campground. They would stay all day and then "head back to the campground to cook dinner".
I've said this before, but I just don't get this. How do you know "they" got off the bus or that "they" came from the campgrounds or that "they" headed back to cook dinner?
If you're at the pool, you can't see the busses or even the boats for that matter. Perhaps you might overhear someone say something that would lead you to believe they aren't staying at that resort, but an anecdotal incident doesn't translate into a horrific problem of overcrowded pools due to pool hoppers.
In none of our trips to WDW have I ever noticed someone at our pool area that was obviously a pool hopper. Then again, I don't pay any attention to what other people do. It goes without saying that one shouldn't pool hop without permission. However, I think it's a huge overstatement to say it's the main reason for overcrowded pools and it's impossible for any of us to know that. There would have to be an awful lot of pool hoppers at a pool at one time in order for it to make a significant difference. The pools are crowded because there are thousands of people staying at the resorts and naturally the pools are crowded during certain times. I'm not saying it doesn't happen, I just don't think it's really a big problem.
Honestly, I think this has a whole lot more to do with people not liking the idea that someone may have gotten something they didn't pay for than the fact that the pools are just over run with pool hoppers. I just don't worry about that sort of thing.
If it were truly the huge problem that this thread would make it seem to be, WDW would do something to curtail it. It's too simple to fix, unless of course it's such a minor problem that it just isn't worth messing with. For now, it would seem that WDW thinks the cure is worse than the illness and I agree.