On the whole Xurkitree matter - yes, I'll admit, Xuriktree is possibly one of the most constraining mons on teambuilding in the metagame - the brute effectiveness of being able to guarantee sleep something only aids Xurkitree's phenomenal power. The problem stands with the fact that not only is there no defensive counterplay, there are also very few which can dispatch of Xurkitree under webs. This leaves it with only one practical revenge killer - Naganadel. What I dislike about this is the fact that you are forced to run it without dangerously switching between checks in hopes of getting Xurkitree to bounce back its Hypnosis with something like Magearna or Zapdos. Whilst I do not believe it is nearly as bannable as Deoxys-Speed, I do believe that after Deoxys-Speed's fate is decided, it may become too lethal for the metagame. Regardless of that - there is counterplay out there, but it is more in control of the player outplaying the opponent more than anything else. Xurkitree is unable to dent much into a more offensive team without Webs and I feel is a centerpiece of the playstyle - most of its effectiveness is the due to the capability of its removal. So whilst I do believe it could be bannable in the future, I think it is too early to tell at the moment if Xurkitree is bannable or not.