I will simply say that I don't see that at all. Kylo Ren is honestly the one consistent thing that I disliked in both The Force Awakens and The Last Jedi for basically the same reasons. I don't see him learning, or any reason shown to believe he's capable of anything more than we've seen to date. I honestly wish he could have been cast aside with Snoke so that we could have a villain worthy of being the main villain of a film instead - though of course that was never going to happen in the middle of a trilogy. If that doesn't happen after Episode 9, when it actually makes sense for it to happen, the odds of me ever going to see Star Wars films other than the side stories will likely drop substantially.