They should just make this change optional.

For most people, like me, who don't play at any other location outside of their home where no one else plays WoW, it's awesome. I can login in about a third of the time.

However, I understand, especially in this community how much people travel for work/business, school, etc and how being able to login with out the authenticator at those locations would be a scary situation.

Only time will tell. I'm sure if enough people get screwed over by this they will revert it. I do see how it could be an issue, but for my own greediness, I love the change.