They're already moving to that! It's called a "Green Funeral" and it's the rage among the leftwing eviro-socialists - who always try to mandate their wacko preference on everyone else.
"Green Funeral" means not only no embalming, but also no burial vaults, no caskets and no carbon fueled hearses. The idea is to degrade in the ground like compost as quickly as possible.
How much more gross can they get?