Good post but you missed the most important reason why the iPad will be a "Huge Success". The fact that Apple fanboys (and girls), or "Lemmings" as I call them will buy anything with the bitten apple on it (okay almost anything as the MacAir was such an over the top P.O.S.) and Apple banks on this with every new device.
They also realize that those same early adapting lemmings will buy each iteration that adds missing features normally standard on every other device in the category (MMS on original iPhone comes to mind). Sure every company does something similar but I think that the fact that a) Apple charges a lot more and b) they are supposed to be so innovative it's an annoying trait of their company.
4 Reasons Why the iPad Will Be A Huge Success and One Reason Why It May Not