They are still not listening
As much as Microsoft might like it, they are not Apple and they're not making iPads and Macs. There is still a sizable community of "utility" PCs used in businesses. For those users, familiarity is key, and that's why I think they should bring back the ability to use classic or Aero themes in the OS.
Think about it -- if you're an enterprise, and 70% of your PCs are used by cubicle drones cranking out various tasks, you want to keep things as static as possible without getting hacked or losing support. Now Microsoft comes along and says "all is forgiven, have a free Windows 10 upgrade." Wouldn't it be great if a business could swap out the user's OS, and it would mostly look like and work like the Windows 7 they were used to? I could see that as a huge selling point for non-consumers.