If I had to pick at this point for the next rotation, I believe I would favor rotating to PLF-On or LTR-On; cutting straight to XY-On (again, at the expected future time) would leave us with two, maybe three sets. LTR-On gives us four, and while some amazing cards from the BW-block are preserved, a lot of their support seems to vanish. PLF-On was interesting; I was mostly playing Devil's Advocate when someone asked for justification... and then I realized that cutting to PLF-On would actually kick the support out from under one or two established decks, but mostly serves as a preventative measure. There are a lot of cards in DRX, BCR, and PLS that aren't problems right now... but when you rotate you need to look out for what is and what will be and those three sets have a lot of "near misses". Edit: Apologies for poor wording. "If I had to pick" can be read as "If I had to guess the rotation right now" and not "If I were the one in charge and deciding where to rotate, based on the current card pool".