I've always liked debating but I've been starting to grow tired of it lately. It's so rare for anyone, including myself, to change their opinion on anything through an adversarial process like debating. It feels like complete and utter waste of time, if the goal is to make someone reconsider their position and hopefully come round to yours. Debating is hardly ever even a learning experience for oneself, either, except of course in the art of verbal combat or, more usefully, logically dissecting an argument.
There is, of course, some potential to persuade fence-sitting third parties who have not yet formed an opinion let alone a conviction on the topic of debate. But those people will rarely provide any feedback to either side and whether or not such people even exist is often a matter of pure guesswork. On online forums, debates tend to make up long threads that no one else participates in and most likely will never read.