It *seems* the bigger target was the split stay people, because they've been the most impacted. Which is unfortunate, because as I posted before sometimes it's hard to get a resort for the entire length of a stay, which is the boat my DVC family is in now. Disney needed to come up with some FP+ availability for the new hotels and whatever they are planning for the paid FP+ changes later this year. It seems the biggest way to get more availability was to close the split stay reservations.
I've been checking the campsites for my week in May for the past two months, both before the announcement and after, and there seems to be the same availability. I'm not convinced the campsite throwaways are the biggest target since they don't seem to be used as much. There's not a lot of them to begin with, there's still availability---I just checked my dates again and there are campsites (all three types) for Monday to Friday for my week. Two hundred campsites vs. several thousands of resort rooms with split stays....seems pretty obvious which one was a bigger issue as to where the FP+ were going. There are a lot of people who spend a few days onsite and a few offsite too. They have their rolling window closed now too.