Following my hack, I changed my email address to a wow only address, the email is dedicated to my battlenet account and not used for anything else. I use Outlook and so just collect the email from it in the same way I get any other email but never use it for sending emails. The only issue I have with this setup is that legit gm emails got caught by gmail spam filers and so I had to add it to my safe list.

I agree that having battlenet as an email address does increase the chance for the regular user to get hacked, and in fact may have been a contributer with my old email which a month before getting hacked started to get a lot of random spam emails which I presume was caused by a forum or some such sharing that email with someone else and so got me spammed.

My real issue for those of us that chose to combine all their Wow accounts under one Battlenet account (pretty much the way Blizz wanted us to and designed it to work) have everything exposed once that single signon is compromised, THAT SUCKS!