Thats not the point, everyone thinks that there is an answer to this question and trying to answer it but the reality is that the question is wrong, so you can't ever give a correct answer to a wrong question. There is no decoupling, bitcoin and ethereum (and everything else) is still connected to each other and I believe that it will be for a long long time. This means that we are going to see them move together as well, that won't really change anything, we should just let it be and consider this as quite a possible situation. I understand it may not feel that way at times, but it is very much connected like I mentioned.