The majority of users don't live in a Ubuntu world, they have to deal with Microsoft at their job or school. Corporations are demanding Windows 7 over Windows 8.
And Linux users have a full spectrum of distributions to choose from. If Ubuntu acts like an ass-hat, I can easily switch to Mint when the LTS version is no longer supported. I have a choice of desktops environments that all run the same services and applications. I'm not locked in, nor is my data. Squeeeeeee!