I think too many people have been subjected to bad e-mail interfaces for too long, especially with regards to spam. Being exposed to a nice interface like GMail or a personally-configured solution with a nice SpamAssassin learning filter would go a long way towards making people appreciate e-mail more. I always find myself surprised when people still cite spam as a major problem, but those are inevitably the people who are using a default install of Outlook or a crappy webmail interface for their school. E-mail might die for these people, but for those of us who know how to actually use e-mail effectively, I don't think it will ever die.