iPad Air has 990Mb of DDR3 RAM. With 64bit processes, 30% more is consumed; leaving 660Mb. After running iOS 7, your free ram is around 200-300. Apple.com loaded in safari leaves only 50Mb free. I'm sure I not the only one that knows that it only gets worse with iOS updates (apart from iOS 7). iOS uses ALL trchniques used in mavericks to make it more efficient (including ram compression). The time it takes for apple to think of more techniques, the iPad Air will be long gone.
I'm amazed that everywhere there is always people like you, think they will say a smart donkey question. Fact about these people; nobody likes them, nobody.
I'm amazed there are always people like you, who will make a prediction about an operating system that won't be released for a year with no evidence to back it up (nothing in any of your posts supports your assertion that iOS 8 will have higher system requirements than 7 to such a degree that it won't run acceptably on this year's hardware). Fact about these people; nobody with half a brain listens to their FUD-spreading, nobody.