The switch doesn't have to happen overnight, for all contacts and groups. And you can just run them next to each other. People have just switched messengers in

The switch doesn't have to happen overnight, for all contacts and groups. And you can just run them next to each other. People have just switched messengers in the past fine; ICQ -> MSN -> google chat / fb messenger (and I probably forgot a few). I agree that Whatsapp has become more "critical infrastructure" than messengers were, but don't give up right away because it seems impossible