I think the impossibility of cancelling an account is just the stupidiest strategy to keep users. I am fed up of loosing comments in wordpress blogs because I once thought I would migrate to WordPress and I didn’t, but I can’t go back. Do you want me to put a dead-end e-mail? You got it. I really don’t see why people should be forced to stay with anyone. If I want to move to wordpress in the future, I can take that decission on my own. Cutting my degrees of freedom does certainly not help me being enthusiastic about the idea though.