Do we really need email anymore? If we don't solve the spam problem soon, maybe killing email is the best solution. Most of the people I email, I can talk to on IRC/iChat/web discussions/RSS feeds/whatever.
About 5% of the email I get is NOT junk. Why bother anymore? I used to think of different ways to fix SMTP and the infrastructure, but maybe it's time to just stop using it. Remember when you thought you couldn't live without Usenet?