I think this is an excellent idea, however from the standpoint of someone who provides tech support to students at my university, this would be a disaster for a good portion of the student body. A good number of people here can barely turn on a computer (and we GIVE THEM a laptop). Assuming that people have an identity established seems logical, but is still too early. Some may say these are outliers, however looking at our support tickets, I'd say a good number of people have one email address, and thats the one we give them.