The problem with being only one thing forever is that the odds of it working are really bad and if you don't have very broad skills/coping mechanisms, you can get screwed when things shift. Colleges/universities are changing drastically and that's not going to stop either and there's only so much room/need for all the professional students without real world experience.

I recently graduated from a very well thought of university but over 95% of the courses are taught online and though all the professors are PhD (required of this university, no MA's at all) mine were all only part-time too and had very exclusive full-time jobs/experience (several of my history professors worked for the CIA and my European history professor had first hand experience with the fall of the Berlin Wall; my Chinese history professor had similar, real Communist Chinese political experience and I had real, behind-the-scenes, field trips in Washington, D.C., all as an undergrad).

I don't think you can get to the life you would like/envision without work in other areas to create a more solid base. I would make sure you learn to write novels or invest in a great portfolio or expect to inherit something interesting before I got too single-minded?