I think he’s hit the nail on the head with the iPad. It has its professional niche, of course, but I believe (and I have no facts to back this up) that the main uses for iPad are to browse website, watch and listen to media and play casual games.
No matter how much they push the idea, it just isn’t suited to a lot of productivity applications and that’s got nothing to do with its power, it’s got to do with its screen size and it’s lack of precise input devices.
My ageing iPad 3 does exactly the same stuff today as it did on its release. For me, that’s visiting websites, watching YouTube, Netflix, Hulu etc and very occasionally playing a game. It’s by and large a toy and that’s ok - there’s a market for it, but it’ll never be as big as production computing.
When I go to the Apple store and pick up the new iPad I go “Meh. Looks nice but it’s just an iPad”. Why would I buy a new one when my existing one does the same thing? Until I can’t consume today’s media on it I have no reason to upgrade, and unless you are a hardcore iOS gamer the extra power in newer models is impressive but not a deal maker.