This behavior will train users to believe that the www in domains isn't important, when it actually serves a very important purpose.
You can't cname example.org, which makes it very hard to use a CDN to serve it unless the CDN provides anycast ips or you delegate DNS to the CDN.
If they're intent on making the address bar useless, they may as well go full hog, like Apple does in desktop Safari -- the address bar shows the domain only, until you click.