J.J. allegedly wanted to show a Gungan pile of bones.
He should have done it though it could be seen as needlessly pandering to the core fans. I wouldn’t have cared though.
Palpatine allowing JarJar to live a quiet life forever haunted by his role putting him into power would be a far worse fate though.
I doubt Jar Jar has the mental capacity to even comprehend what his idiocy brought about. I think above all else that is the worst fate.