Ive been thinking about Death Saves.
In my current 5E game I house ruled we use the Shadowdark system for Death. Basically a bleeding out effect.
Anyways, after talking with one of my players I've reconsidered Death Saves because it was pointed out that it gives the player something to do on their turn. And as much as I hate multiple saves and think 5E takes it to easy on players, that is a fair point. I may even let this carry over into other D&D type games. This of course would still be an issue if someone gets turned to stone or whatever but hey, don't get turned to stone.
So I reinstated it with 1 addendum, you gain a level of exhaustion whenever KOed.