It was a matter of time.
The only thing that really concerns me in this though, is that you REALLY SHOULD get yourself a blizz.authenticator for extra account security.
Currently, people need your acc name + password to log in.
If you merge your acc with the battle.net acc, then they ONLY need to know your email, and password.
Passwords are at times guessable, or brute forceable. Get the authenticator, you wont regret it.