I'm not really sure what the point of this thread is? Who the hell really cares if they ever made a joke about Sepultura? Sepultura had SOME popularity in the early 90s and that was it. I doubt any of the big four honestly give a shit either way about it.
Sepultura has never been nor will they ever be at the height of popularity the big four were in the 80s and early 90s. So, i'm not sure why their popularity wavering would even be a consern for them. Because they've already been there and have their own shit to worry about.
Also, except for Metallica, the other three have experienced the same thing as Sepultura in tems of declining popularity and album sales in the US. It doesn't make much sense for them to make jokes about a band going through that when they themselves have been going through it since the mid 90s.