When email is secure, I think you'll finally see faxes disappear in the banking world. Not one day before, though.

And before you argue: Yes, yes, PGP and all that. It's not the same thing, and you know it. Email by default is unsecure and easy to hack. Faxes aren't secure either but it's harder to tap undetected into a fax line than it is to intercept incoming SMTP traffic.