The average anime or children's cartoon won't compress well with this approach unless it's authored with it in mind - if you look at the average anime episode it's full of raster effects, layered gradients, 3d perspective, and mixed in 3DCG. Worse still the anime is typically sent to the broadcaster in an already-lossy format so the vectorizer will have to handle macroblocking and noise.

Here are two random screen captures from anime airing this season:

https://pbs.twimg.com/media/EdP8gc4WAAAbkWy?format=jpg&name=...

https://pbs.twimg.com/media/EdPwGmyXoAIjlGw?format=jpg&name=...

Suffice it to say that vectorizing this content would be difficult and the vector representation wouldn't be particularly small.