Renunciation of their past, decimation of membership, change of name, dozens of splinter groups, financial ruin, complete disunity, you don't consider that collapse?
If that's your definition of survival then I guess I agree with you that Watchtower will "survive".
In order for it to be described as a "collapse" what exactly would you demand happen? That there be no members of Watchtower or any successor or splinter organisation anywhere in the world instantly? I think we can agree that's impossible. But if that's the only measure you'd accept then I guess you will always be right about Watchtower "survival".