If it becomes apparent that your platform is not a good fit then it's better to move sooner than later. That said, if Win8 is enough to put you off, I'm not sure what lies ahead for you on Linux.
I didn't get along with Windows Vista but I quite like Windows 7, I hated OS X 10.7 but I like 10.8.2 again. There must be many examples like this - it's hard to predict what kind of beast Windows 9 will be.