I genuinely don’t understand the idea of “quitting” MLP. I don’t even know what it means, but people say they’re going to do it all the time. Do you mean not participate in the fandom? If so then I kind of understand that. (I arguably “quit” since I stopped uploading BGM to Youtube, which was my main contribution to the fandom, since others have taken over who do it better and way faster, and ever since getting a full time job I can’t keep up with that). In fact over the past 5.5 years, there have been many instances where I’ve basically stopped interacting with the fandom for months, even almost a whole year, at a time. (Yet here I am again…).

But what I don’t get is “quitting MLP” altogether. Do you mean you’ve decided you will stop watching all future MLP, in any form, after season 6/the movie? If that’s what you mean, as opposed to just leaving the fandom, I’m interested in your reasoning. I feel like since we have literally no idea what’s going to happen next you should be willing to at least give it a chance. (and, while I’d love to be proven wrong, I agree with you that there are many indicators that S6+the movie could be the last of FiM/MLP in its current incarnation).

A personal example for me is Sonic the Hedgehog (yes I know… I’ve been part of two of the most “disliked-by-outsiders” fandoms ever to have existed (I don’t like using the term “outsiders” when referring to fandoms; It’s not like fandoms are an exclusive club or anything. But that’s a whole different discussion)). Anyways when I was a little kid I absolutely loved the Genesis games, and when I was about 10 or 11 back in 2001 or so, and continuing into my teen years, I really got into the fandom including posting on forums etc. Eventually the fandom became… unpleasant to be part of, to put it one way, (the Sonic 4 “green eyes” fiasco being one of the fandom’s lowest points) so I stopped interacting with the fandom for the most part. But I never “quit Sonic.” Most of the more modern games have been pretty bad, but I’m still willing to give them a chance after reading reviews etc. (I enjoyed Sonic 4 Episode 2 and Sonic Generations). I even watched the new Sonic Boom TV show for a while, but it’s just not for me.

A better example (maybe?) for a lot of people would probably be the new Powerpuff Girls reboot, but since I never really watched the original I can’t speak for this. But from what I understand it sounds like most people, including fans of the original, were willing to give it a chance despite it not having Craig McCracken’s involvement or the original VAs. (Now, I know the show has turned out to be really bad, at least so far, but that’s not the point here!)

The point of all this is that I’m interested in the reasoning behind why someone would permanently quit something they used to really like, going so far as to announce it far ahead of time basically like you’re retiring from a job. You said it’s not because of the producers (and by produces I assume you just mean the content creators, so the whole show staff and creative team. Which would mean it’s also not because almost all the original writers being gone, which I’ve heard others use as a reason for “quitting.” Though I may be wrong on this, if you really did mean just the producers/directors/etc (Jayson & Wootie, now Jim Miller, etc).
Going back to seasons 1&2, everyone, including me, was upset when Lauren left, and lots of people said they were done with the show. But I’ve managed to mostly enjoy the show despite her absence, even though I personally think her original vision for the show, had it continued and been allowed to grow, would’ve probably been better than what we currently have. But that’s impossible to know for sure!).

The only other reason I could think of would be if the mere existence of the show it were affecting your life negatively in some way. But this still wouldn’t really make sense to me since in that case you should be quitting now, or should’ve already quit. Or better just become a “casual fan” and watch the show when you feel like it/when you have time and don’t take anything related to MLP seriously.

Sorry for this extremely long, rambling, and mostly pointless comment. I’m not trying to give you a hard time or anything so I hope this doesn’t come across as accusatory or condescending or whatever. I’m just curious. Feel free to completely ignore this comment, or respond if you wish.

tl;dr: Ever since Lauren’s departure, people have been threatening to “quit” MLP, and I don’t know if they mean just the fandom or if they literally mean they’ll never have anything to do with pony ever again and if the latter, I don’t know why. Lots of fans from 2011 are no longer active in the fandom, but I’m willing to bet most of them still watch the show, but just take a more casual approach to MLP. That’s what I do anyway, and I look forward to seeing what comes next. If it sucks, it sucks, but I’m willing to at least wait and see.

tl;dr tl;dr: We all know no one can get off this ride. The ride never ends.