Yes, I do believe it is possible for someone not to have a hobby. When I grew up this was the norm for all of the adults around me. They worked, kept house, shopped, watched TV and that was it. I did not know one adult with a hobby they were serious about, not one.
I think this is more common than not. A few years ago I reviewed a wonderful book called
Get a Hobby. The book outlines the benefits of having a hobby and provides dozens of great hobby ideas. One benefit of having a hobby is that it provides stress relief.
Watching and rating movies is one of my favorite hobbies, and of course I write.