Just to state the obvious... you simply cannot take up land for every dead body, otherwise you will run out of land. That is basic math. There are more people living on the planet now than ever and it's about goddamned time we did away with this ancient and outdated tradition.
Here in Hawai'i, most people have the right idea; cremation and spread your ashes to sea. We're on an island and land is limited, so people have figured it out sooner. Yet, I still see old graveyards and they are a blight on the land. And quite honestly, they are a waste of land. I can kinda understand people back in the day buying into this shit but nowadays? The fuck? It's a dead body. It does not need a 3x8 plot of land to house it for the rest of eternity.
Oh and if you object to this for religious reasons... well, fuck your religion and fuck you thinking your dead relatives deserve the right to continue take up space. They're dead. Fuck you. Move on. You wanna put down some flowers for them? Get a picture frame and put it in your home next to a flower. The rest of the world does not give a shit about your dead grandmother.
Ashes to ashes and dust to dust... if you don't like it, I don't give a fuck.