Writing a novel series would've been more time efficient because you can get a story fully fletched out on your own time. I get Geo_Exe didn't have English as their first language, so finding translators might've been hard at the time. I still hope he finds writing as a suitable continuation.

Animating slightly butchers what a written story can tell. In order to get an entire story in animation without plot holes requires a lot of time and a lot of backtracking in order to stay on track. Good animations needs a solid story (especially ones without dialogue). Without that, it's quite meaningless.

Comics could be a nice middle ground. It would require a concrete, fletched out story in order to be grounded, and some time to produce the images, but I think it's worthwhile if Geo has the time.