I actually like this idea. It's realistic, and makes getting into ANY fight scary, as it should be. D&D is too far in the opposite "video game" approach for me, where everybody has healing magic and no fear of death from a crazed farmhand with a pitchfork or courtesan's dagger. Players should ALWAYS try to find a non-combat solution to any confrontation, for their own good health, so that when all else fails, and swords clash, it feels truly brutal and barbaric, like there was no other choice, and that it's "do or die." Those are the battles you will remember and talk about... if you live, or if you don't die a lingering death from infection days later.