People have succeeded having done all kinds of degrees. At the same time, people have done less well in life (I don't think life is something you can 'fail' - we all die, so what does 'winning' involve?) having done all kinds of degrees. There's a lot of degree snobbery in the world (it's especially concentrated on TSR, so make sure to dilute before drinking) but I would try and ignore it if I were you. The happiest people are those who have followed what they want to do, not what other people want to do, and happiness goes a long way in helping you to succeed. Unless you have happiness and motivation even the most TSR-approved degree won't get you very far.
You can do all kinds of things with any arts/humanities degree - the American Studies degree is no different.