Removing the home button would be a mistake. I know a novice user who sticks with iDevices (as opposed to Android) precisely because they have a physical home button. As they describe it, "it's a magic button that's always there and always gets you back out of whatever you're in". By contrast, they dislike Android devices because of the virtual buttons that are sometimes removed in favor of more content. Usability is…
I do not think it is just novice users that like the home button.