Its not about controlling others. Just because there's waza it doesn't mean Aikido ends there. Its really about gaining control of yourself/ego.
Its a hard and neverending journey and that's why Osensei himself says he is still learning aikido even as he reached his deathbed.
You are of course free to leave at anytime and whatever you have learned will probably serve you in good stead. If you still continue to train to master yourself, in the end the path you choose is bound to meet someone who remained in Aikido seeking to master himself as well. Aikido is just one of the many ways to mastery.