Well, hg always annoyed me b/c I use git at work and I am more used to it, but this move by atlassian is pretty sketchy. I'd see this as an opportunity to dump them altogether and moving to another hosting provider. Although as a1ex points out it does suck to loose all that history. Maybe they will relent as google did with nest recently. We should all probably complain loudly, just in hopes of keeping options open.