It's such a silly argument. For some people it can replace a laptop. But that's always been the case. For some people, it is the only device they need. My wife is a great example of that. She only uses an iPad and a phone---nothing elseSo... what? We just ignore the fact that it has already replaced laptops?
But that is not the user we're talking about. The user we're talking about wants to do all the "Mac" things on an iPad.
The iPad can't do all the Mac things well enough to replace a Mac for most users, especially the ones reading MacRumors. That's the user we're talking about.