The innovations are good. But what's the point in wyvern nests now? And what about the wyvern milk? It will be strange if a female wyvern that has laid an egg will not have milk, but the wild one has it.
And what about stat rebalancing? Do you mean nerf? Crystalline wyverns are weak. They faster, they pretty, but they weak. I won't excahge any of my classic wyverns for a crystal wyvern, even if they give five for one. Now are you going to make the classic wyverns as weak as the crystalline ones? And what kind of reaction do you expect from players when they realize that their wyverns have become useless for their tasks?
Like i said, the innovations are good - but it would be better to leave the wyvern as it is. It's my opinion