AFAIK, the "Secret Question" actually locks your account. So I don't think it's one of the major reasons why many accounts are getting hacked.
Spot on! Secret Question account recovery just locks the account, it has nothing to do with account hack.
I remember I was worried about Secret Question too since I heard that it can lock the account. I was looking for help here and there to know how to remove it so that I can feel safe. Then one day after following a post, I gave it a try to remove it and it worked. Since then I have no secret question attached with my account.