Yeah... honestly I feel like it wouldn’t be so bad, if they would just nerf the shiranui/invoker decks like they should. But because they exist, I have to agree. Also, yes I understand karakuri and crystrons would probably take their spot.
Shiranui & Invoker? Excuse me, Karakuri & Crystron are much more broken in the current meta. Turn 1 full board / Synchro summon during opponent's battle phase. Whatever new XYZ cards got no chance against them.
I'm a KoG player and I do agree that Karakuri & Crystron are tier 1. While Shiranui & Invoked Magician Girl are only tier 2. Even if they nerf both tier 2 are you sure that your new XYZ deck can even beat those tier 1?