the death of e-mail

Thanks to facebook, my Yahoo e-mail address has been put to death. Almost everyone in my address book is on facebook so i send them messages through facebook rather than signing into yahoo and writing a traditional E-mail. I still use my school email to talk w/ professors and see what's going on on campus, but facebook groups exist that give campus news, and if all of my profs were to get on facebook and check it regularly, i forsee then death of the school e-mail