Believe me, I'm not looking to end up in a debate, especially not with someone I like on these boards. At the end of the day, this movie has been debated to death on these forums and all around the internet, so spending more time on it than the occasional point here and there is just not something I care to do anymore. Especially with a new movie coming out to hopefully move past all of this TLJ stuff.
As crazy as it is to say, I do actually know two people who have sworn off Star Wars entirely due to The Last Jedi. One is a friend of mine that's a pretty Star Wars fan, the other is one of my best friends that puts most Star Wars fans to shame. This guy spent tens of thousands of dollars on Star Wars memorabilia and collectables, went to as many Star Wars conventions as he could, paid to have stuff signed by Mark Hamill and Harrison Ford, and was in the process of creating a Sandtrooper cosplay to join the 501st Legion with. He was no joke as a fan, but he's been selling his Star Wars stuff - pretty much everything except his really vintage collectables - and he abandoned the plan to join the Legion. And this is one of the more level headed guys I know.
And of course, you can't go on any Star Wars post on social media without the people wearing they'll never spend another dime on Star Wars. It's unavoidable.
Like you, I grew up with the OT. I was born in the late 80s and was 12 when The Phantom Menace came out, but by that point my dad had me fully invested in Star Wars and I was a huge fan. Other than Attack of the Clones and The Last Jedi, I've enjoyed just about everything Star Wars that's been on screen (I can even enjoy TPM, if I watch it on DVD and skip the entire podrace sequence). I could never imagine ever swearing off something I love so much. The story, the characters, it's all meant so much to me. I have no choice but to accept the movies I don't like as canon, but I can just avoid watching them and spend time with the films I do like. It's as simple as that.
I didn't mind TFA, it has its fair share of issues but overall it got me excited for more Star Wars movies. TLJ, I absolutely hated. And it was so much more than just the Luke thing. I don't agree with it, but I can understand it. Like you said, we all change with age, and Luke was no exception. And I've said that same thing about Luke running away having humanized him as a character, whether or not that was necessary is an entirely different debate. My issues with TLJ are different - Admiral Ackbar having an off screen death, the entire Canto Bight sequence (waste of time), Rose as a character, making Poe (originally a cool character) seem incompetent, and ESPECIALLY the Princess Leia/Mary Poppins scene in space. I just hated too much about the movie to like it, but that doesn't mean I'll swear off of it. Unlike most people, I enjoy Rey, so I'll keep up with it to see more of her story.
But anyway, I'll agree with you, with the money this film made, in no way was it a failure. It was definitely a financial success. But I'll 100% stand behind my remarks that the franchise was definitely hurt by the movie, because with so much negativity surrounding it and so many people losing their love for Star Wars because every major original character is gone, and not in a way they would have liked, the hardcore fans and collectors are going to be taking steps back, and that will hurt the financials, as evidenced by that Forbes article. I don't think Star Wars is forever damaged, but it's definitely damaged as a result of TLJ.
Sorry for the long post.