This could be a really good, or a really bad idea.
Explanation - A headshot kill with any weapon no matter what it is will remove said persons ability to be revived (just like getting headshotted with a sniper).
What it would do - More of a incentive for to go for headshots, A skilled player could stop a medic train, and add more to the skill level.
I’m concerned about its implications in Pub games but I could see it’s usefulness in competitive and once again add to the skill level.
Downsides - Nerf to all medic classes, and a soft nerf to vasilli. (as a vasilli player this hurts my heart </3)