I do wonder how many "pro's" people think are in the world ready to buy these products?
According to this:
http://www.statista.com/statistics/382302/unit-sales-of-apple-by-product-category/
Ipad's sold 16.12m units last quarter and mac's 5.12m (which includes iMacs, mac pro's, MacBooks and mac mini's).
So 3 times as many users do not need the "pro" features of the mac in a device like that ipad. Any movement towards matching the pro features and flexibility of the mac on the ipad will just canibalise Mac sales. And since the average selling price of the mac is way higher than the ipad surely too much movement in that directoon would be insane for Apple to do.
The reality is that there are a handful of "pro" users who harp on about the Surface pro and making the Ipad run OSX and chant "feel the power" as if anyone cares. No one cares. When the mac pro came out after all these people were clamouring for a super computer, no one bought it. Because, the majority dont care about "pro" features. Making IOS and Ipad's more complicated like PC's is not going to increase their sales.
What is killing ipad sales is the iphone 6/s plus. It's that simple. And that isnt going to stop. All Apple can do is raise the average selling price by moving the ipad to a higher price and offering more features. I bet the new ipad air 3 is more expensive and the ipad mini will be moved higher up in price as well. Apple will find a natural amount of unit sales for that product ,maybe between 10 and 15m a quarter and that will be that.
I dont think there is anything they can do about it but accept that they deliberately killed ipad sales to push the iphone against Androids last selling point, the big screen. And it worked.