I appreciate your point, however - if you wish for this series of communities to succeed, it needs to be welcoming to newcomers. And one of the ways of doing that is allowing for a continuation of conversations that were on the source communities - including, "Oh, we're getting out", "Why it's so bad", "Where do we go to", "How do we make the new community look/feel like I'm used to", etc. etc.
I'm happy to see this because it means that a corrupt and non-people-focussed environment is losing members. Like anything, it will pass, but please don't push people away by making them feel unwelcome.