How is that problem solved? The point is to combine the two without tradeoffs. An iPad can't run OSX, Windows, Microsoft Office, any of my engineering programs (Cadence, LTSpice, FPGA Advantage, MATLAB, etc), utilize USB peripherals, or even multitask in work flow sort of manner. And an MBA isn't as ideal for perusing the interwebz, reading books, playing touchscreen games, connecting to 3G/4G/LTE, having 10 hours of battery life, or doing anything else the iPad excels at. But melding the two together? Sweet harmony.
I mean, seriously, were all you naysayers against putting cameras in phones? Having phones with internet capabilities? Text massaging? Was there really a downside to converging phones/pages/cameras/gps devices/compasses/voice recorders? Sounds like you're all neo-luddites lol
Oh, and as for if anyone is buying them, yes... they're selling. They wouldn't keep making them if they weren't. Besides, you could have that same argument with Android tablets in general. iPad dominates the market, but that doesn't mean Android devices aren't selling. Consequently, a hybrid device is already fighting an uphill battle if it doesn't have an Apple logo on it.