Microsoft got that one right. Surface devices are far more than the Android/iPad tablet toys to kill time or hand to the kids. Tablets are devices looking for a use case: I don't see myself putting my phone aside to use a phone with a bigger screen, and that's exactly what you do when you drop the iPhone to use an iPad. In fact it makes a lot more sense to have phone/tablet combinations with different platforms (Android/iPad, or iPhone/Android Tablet).
In any case, tablets as big phones are the ones that are having a rough time. But Surface-like devices, with Intel CPUs and a full blown desktop OS, those are the ones that will remain because they fill a real use case. This one for example ... not even $100 for a quadcore intel 'laptop' (that kind of tablet is the real chromebook killer ... maybe not laptop killer, but it would cover at least 50% of laptops use cases):
The hardware is still kind of junk (mostly the display), but eventually it will catch up. How can you compete with those specs and prices, and we are talking about a full blown desktop OS.
In my opinion what makes the Surface so unattractive to most users is that it uses Windows. An iPad like device with OSX would be a real killer. Let's hope Microsoft at least gets Windows 10 right, because it doesn't seem Apple wants to enter that market.