Well, if we're talking about the long game, let's continue following that puck :)
As smartphones become more and more popular, they reach further and further down towards groups of people who can't afford iOS devices (unless you're counting second hand devices). I don't really see Apple's % of the market ever going up.
As the market matures and the hardware reaches "good enough" levels, the overwhelming majority of smartphones used will be the equivalent of the "beige boxes" of old (from the PC world). On top of that, the app competition is becoming so cutthroat that app prices will probably continue to go down (per app).
So, long story short: Apple will probably never enjoy a bigger share of the smartphone market than it did in the past and most of the competition will be around hardware and software with razor thin margins.
Meanwhile, more and more people from developing countries will start working in companies which use overwhelmingly... Windows desktops and associated software.
They will also use and pay for various services, some of which, as you noted, will be hosted on... Azure.
Microsoft's main cash cows will never dry up. Companies want/are willing/are able to pay for software.
I think that the longer term threat for Microsoft is Amazon, not Apple.