This is still th biggest hinderance to bitcoin getting mass recognition.
It is far to unsafe to store any real wealth in for the average person.
umm no, brain wallets have nothing to do with the average person holding funds, the average person would use electrum or HD Multibit and a mobile wallet for on the go.
I think the amount of noobs using brainwallets will be rather high. Because A, they don't know or realize how insecure it is and B, because noobs everywhere are asking about things they heard or read about. "Coldwallet is safe, where do i get i", "Paperwallet is great, i want one", and so on. They read something and want it. So i think many noobs will have used it.