According to information from the blog sakugabooru , the anime Shingeki no Kyojin (Attack on Titan) may end its run at Wit Studio .
While not officially confirmed, this rumor is being circulated by employees working within the company, who claim it's uncertain whether production will continue into a fourth season.

Many projects?
According to the blog, it's most likely a large accumulation of projects for the studio; besides Attack on Titan, the studio is producing the Koutetsujou no Kabaneri , a new series titled Vinland Saga , and other anime that Wit Studio is helping to produce.
Weak animation?
Drawing a parallel and observing the details of the current season of Attack on Titan, one notices a significant drop in animation quality. However, compared to the earlier seasons, the animation quality of this series demands a high level of complexity, which complicates the work and effort of the animation team, in addition to the tight deadlines for delivering the episodes.

Above all, the anime won't stop being released due to the enormous success of the manga, second only to the classic One Piece. If that happens, which high-level studio would you like to see animating the 4th season of Attack on Titan?
manga series is written and illustrated by Hajime Isayama. The saga was first published in September 2009 in the monthly magazine Bessatsu Shōnen; since then, the chapters have been compiled and released by the publisher Kodansha.
In Brazil, the manga has been licensed and published by Panini Comics since November 2013.
Finally, the story revolves around the character Eren Yeager in a world where humanity lives surrounded by enormous walls to protect themselves from gigantic creatures, the Titans. The story narrates humanity's struggle to reclaim its territory and unravel the mysteries surrounding the appearance of the Titans.
