If you want to create an MMO, then go for it, only you will know if it is the correct path whilst travelling along it.
You said it yourself, that you are exhausted with the games you play, so, do you think the quality of the graphics will make a difference to your motivation? if you
want to create an MMO, have you ever considered a text based MMO? This will enable your imagination to run wild without the need to create graphics.
Because you're not the only person applying for the job. Imagine an employer who wants 1 person, and 10 people apply for the job. He's probably not going to choose the one who doesn't have a degree, to put it that way.
If the employer is a good one, they will choose the person with the best portfolio and potential.
John Carmack never had a degree, in fact he dropped out to work freelance.
----------------------- @buttear ----------------------- The only person who can decide if its worth it, is you. You don't necessarily need a CS degree but in this day, a degree is a bonus for you, anyway, why rush to get to the world of work? Continue your studies and have some fun before being part of the corporate jungle!