The final episode:
Mr Burns kidnaps Simpsons creator
Matt Groening
and threatens him with death - he will be force fed into the main Springfield nuclear reactor - unless he writes a fitting ending to the Simpsons; one in which Mr Burns becomes even more wealthy and attractive to the opposite sex.
Matt says he can't come up with an ending as he's suffered from writers block since 1996. Matt persuades Homer to write the plot of the final episode..

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For the last one they should do a "future" episode where, unlike their other episodes with flying cars and cryo-freezing etc, they just have the Simpsons aged in real time from the ages they were in 1990. So have them be all 30 years older but set in the present day.

Maybe with another clip show.
Metallica, Iron Maiden, and My Little Pony: Friendship Is Magic fan

Oh, okay. That all makes sense. I wonder why they didn't just make it an hour long episode like I said. Why not go out in a big bang and make it special? They never did hour long episodes and if one deserves it, it's certainly the last episode.
I wonder why "Holidays of Future Passed" was written as a finale. Did they think the show was going to end then too? I wonder the same about the Season 19 episode "The Eternal Moonshine of the Simpson Mind" which also came off series finale-ish, but I doubt they intended the show to end then too.

I just wished they had waited to do an episode like that to when they knew they were going to wrap things up.
They did write a final episode, but it wasn't Days of Future Future, it was Holidays of Future Passed'
Negotiations for a new season were going poorly and the network told them to prepare for the end of the series by writing a final episode, and that is what they came up with.
So when they wrote 'Holidays of Future Passed' they did so thinking that it would be the last episode.
It was only months later that they came to a deal. and that deal required slashing the budget by 25% including pay cuts for all the actors.

I think the episode "Days of Future Future" would have been a good ending to the show, especially if it was an hour long. We see Homer die a bunch of times and then it skips to the future and everyone seems to have a happy ending. Now don't take this the wrong way, I'm not saying the show should have ended there. Oh no. I love this show that want it to continue as long as possible even if they have to bring in a new cast and give us three decades with them, but if I had to pick a finale plot for the entire show it would have been that episode. I just wished they had waited to do an episode like that to when they knew they were going to wrap things up. To do that when they were still going to produce episodes afterwards was just ridiculous.