Actually using a Bluetooth keyboard with an iOS device is a massive PITA. You need to explicitly go in to settings and enable and disable it every time. It isn't the easiest thing in the world.
That's not true.
It really is. As soon as I tried to do this I realised how much I use keyboard shortcuts and how much you miss them when they aren't there. Some, not all, can be accessed using accessibility but then that changes other stuff like clicking links.
The other big difference with the surface keyboard is the touch pad. Strangely, having to move from the keyboard to touch the screen to navigate (without shortcuts) is not a comfortable transition from a cursor and mouse.
Also, why is everyone saying that it makes no sense to have a cover/keyboard as it doesn't work on your lap, so you might as well have a tablet and a laptop? I want to use a device on my lap as a tablet for casual browsing and use the keyboard for work where people work, at a table. So as a hybrid it makes perfect sense to me. Perhaps I don't want to buy, own and carry 2 separate, expensive devices.
Once the concept is valid, all that's left is the design to make it work. I have to say I've been waiting at least a couple of years for decent swivel/touchscreen
laptops, but the Surface concept is much less bulky. I've grown out of early adoption however and I'm waiting to see what Blue and Haswell brings.