Remathilis
Legend
I think there is some confusion. I do not want non-magical healing period. That is true whether I'm playing a gritty game or a super high fantasy heroic game. I tend to play both anyway depending on the PCs level.
Second wind does not feel right ever. I agree that there is a real world concept of second wind. I'm not confusing what a dnd mechanic that happens to share a name with a real world concept.
First I am dubious of stamina as a hit point component. In real life it recovers way to fast as it relates to combats taking literally a minute or two. It would also be affected more by a full move than it would by any parrying away of a sword thrust.
I much prefer hit points composed of meat, defensive fighting skill, and perhaps a little divine favor or luck. So as you level up you get far better at minimizing the real damage. Healing could be proportional based on level and I'd be fine with that. CLW would do something like 5+targets level hit points of healing. Multiply that by spell level and you got it covered.
Now I speak for myself. But gritty is beside the point for me.
The DMG is only 320 pages. It CAN'T have dozens of re-writes for PHB things. Today, you want Second Wind replaced. Then someone wants a rageless Barbarian. Then someone else wants a nonmagical monk. And someone else wants a spellless ranger. Is the DMG going to accommodate all that?
JUST HOUSE RULE IT!
It seems like a cop-out, but why is everyone waiting for the OFFICIAL alternative? When the book comes out, tailor it to fit your style. Are we so conditioned to RAW that we can't see past it anymore? Mearls can't know that you want your average 10th level fighter to heal for 3 months from 1 hp to full (and I'm sure that is a minority playstyle). For the last year, we've been told "tinker with it, make it your own" and yet the moment we find something we don't like, we scream "BETRAYAL" and aren't buying it?
I have a feeling the people shouting loudest on Second Wind, Action Surge, Martial Advantage, and all these previews weren't going to buy or play it anyway...