Where Do You See Yourself in 10 Years Time?

You may have come across this form of questioning most likely in an interview. Its a classic question but usually asked in terms of 5 year projection, however the concept are the same. The problem with well worn questions are that the answers mostly follow in a predictable manner. If you have never given this question any serious thought, then I suspect you would be in the majority. So why is this question so popular among interviews anyway?