"Only one problem with that; the classic controller plugs into the remote. Without the remote the classic controller is useless. Therefore, it's can't be a replacement, only a suppliment. Although, you could argue that Nintendo could release a classic controller that interfaces directly with the Wii system."
I figure they would release a slight variation that doesn't need the remote but people with remotes can use the original classic model. The important thing is that the Wii is designed to accept input from the classic controller so it can recognize twin analog sticks, four face buttons, etc.