Why would a technical person see a valid URL and tack on a "www." for no reason whatsoever? Only a non-technical person would most likely do this. Then again, a non-technical person would just type it like it is written. A 301 redirect will solve the illiteracy problem.
Besides, the absolute best reason to get rid of the "www." is that you will no longer sound like a geek when you talk about your website. My website is example dot com, not double you double you double you dot example dot com. Why stop at "www.", if we want to make sure no one makes a mistake finding your website we should say,
"aahch tee tee pee colon backslash backslash double you double you double double you dot example dot com"