Kind of. You're still limited to a single small display and quite limited [wired] connectivity, among other limitations.
iOS is what really needs to be improved to make it more capable like a MacBook, though. It needs to be reworked for multitasking. Can't even have two apps using audio output at the same time.
Yea, definitely. All things I think they can improve upon. If Apple starts releasing some of their software for the iPad though, it could help drive some of those things.