People are too afraid to change fearing they can't learn something new, or they won't know what to do with it if it does crash (which another OS usually doesn't -- they had too much MS shock to realize there's stuff out there that actually boots up properly each time, doesn't get viruses, don't need 'tune-ups', not many incompatibilities, etc). But in holding on to MS, they change the GUI around anyway and they have to learn it all over as you heard people complain with Windows 8. So they just as easily could take that opportune time to switch over.
For me, the "pain" of learning to use a new OS is far less than having to deal with MS pain daily.
On another forum, I compared those who would tolerate such pain constantly like a person who lets themself get beat up in one relationship after another. I could not understand how people tolerate that.
Unfortunately the Microsoft poster I was talking with did have an abusive relationship and the moderator told me to be more sensitive. Oops!
So maybe it is a personality thing, who knows?