The Attack on Titan: The Last Attack movie was recently released in Japan and made many fans happy that they could finally say goodbye to their favorite characters. The movie is similar to the series with the extra post-credit scene but the credit scene made some fans theorize about the Anime and it may quite make sense.
Eren Might Saw His Future
The post-credit scene showcases everyone living a normal and modern life. The chances of these lives they are living might be a reincarnation of their past self. In Attack on Titan Season 4 of Part 2 where Gabi shot Eren, there was a scene of Eren seeing different people and the past Titan Host and the Path in that small scene there was a tiny detail of Mikasa, and Armin is shown as a Modern person. This made fans theorize that Eren might have seen the future towards 2000 years and it was all his plan from the start.
Niccolo’s desire in another Life
During Season 4 of AOT, we can see that Nico wanted to open a restaurant in his other life if it is possible. In the post-credit scene, we can see Nico opening a restaurant and living a regular life just like he wished. There is a chance that Season 4 foreshadows the future or another universe of the Attack on Titan