I don't think anybody in my non-tech circle even knows that messages are encrypted. It's just a convenient way to message people and share pictures from android phones. At some point in the past it was viber and before that fb messenger. I know older people who wouldn't know how to attach a document to an email but can share vacation photos via whatsapp, and we have group chats between friends and family. People also care about their chat history, and if they don't know that the data is encrypted and needs to be backed up, they loose it when transferring to a new device. It's happening all the time, a lot of common users would expect chats to just stay in the cloud somewhere and be available.