A properly managed privy is at least as healthful for people and land as a septic system and is far more than a place to evacuate waste. Ours is a sanctuary in which to be quiet with no one to ask why you aren't busy; to think or read with no one waiting to get in to shave; to watch a small, pretty piece of the day pass outside (one of the clapboards on our outhouse has a crack that's perfect for viewing through, like Arctic sunglasses.
I think these sawdust toilets are actually a viable option. Had some experience with an outside one that used sawdust with each usage and there were not even any flies! And no odor. Seems so simple, but you need a place to empty to.