I personally love email. Maybe some people feel chained to it, but I think my life has gained more than I have given. If people feel overwhelmed they should either prioritize better or take a break. Nice blog post and great topic to bring up. This person has the luxury of doing this though, not something the rest of us have.
Side note, he is giving up email, but instituting a whole bunch of other time consuming, text based ways of communicating. After a while constantly updating twitter, IM's, etc will become just as burdensome as answering emails. Sometimes you just need to bend to the world rather than expecting the world to bend to you.