Report says AWS 10 times the size of all others put together
AWS (...) has “over 10 times more cloud IaaS compute capacity in use than the aggregate total of the other 14 providers in this Magic Quadrant”.
When one party is 10 times the size of everyone else put together, there is no "number 2". There's just a market leader and a more or less equal collection of also-rans.
As for the credibility of Gartner's predictions of what will happen, this is the same company that in 2011 predicted that Windows Phone would overtake the iPhone in global market share in 2015. Meanwhile here on planet earth Microsoft's market share actually fell in that time and Apple shows no sign of being relegated to number 3.
AWS dominates the cloud. Android and Apple dominate the mobile phone market. Yes there are other companies, and they may have nice stuff, but Microsoft's market share is much closer to IBM's (Softlayer) or Blackberry's than it is to the market leaders.
Look, I'm a big fan of Linux, but I don't go around touting reports ("magic" or not) that show that Ubuntu is the number 2 OS shipped on Dell laptops and then claim that makes it equivalent to Windows in desktop market share. But that's exactly what Gartner and the other PR houses are doing with MS Azure and Windows Phone.
Let's look at the actual numbers here, and the numbers say that Amazon's market share is so far ahead of everyone else's that any of the also-rans can really be considered to be niche players. The question for customer then is simply whether or not that niche fits your needs better than AWS.