This is a very interesting Thread.
Please ... keep it up, folks.
Sure...it's all very interesting as long as WotC understands that there are many many players who have stopped talking because there are only so many ways you can say you like things as they are. Not tha it matters that much to me. If 5e comes with rules that require 3+ days to heal, I'll happily ignore them...
I actually hate the idea of "rests" being required to heal...I've been exhausted, battered and bruised in my life...I didn't have to lie in bed to get better. I don't like a mechanic that overly encourages the PCs to hide under a rock for more than a few hours...If I was designing the game, I'd go with something like this:
HP are recovered at a rate of (level + Con Mod)(minimum 1) per time period X of no strenuous activity (fighting, forced march, carrying heavy loads, etc). You can travel, explore, interact with towns folk, etc and still recover hp and HD.
HD are recovered at a rate of one fourth max HD (round up) per time X of no strenuous activity. These HD can be converted immediately into hp if desired.
A period of at least 8 hours of complete rest in a day will allow you to double the healing for a single time period. Hiding in a dungeon or camping out in the wild DOES NOT COUNT.
If you are reduced to 0 hp, you cannot begin to regain hp/HD until you have passed an endurance check at the end of a time period. This check can be aided by someone trained in healing (to give you advantage). Complete rest gives advantage. Being knocked below 0 hp multiple times gives disadvantage.
I'd go with a time period of 6 hours. So a 5th level fighter with 14 Con and a max of 44 hp (and 5d12 HD) is reduced to 2 hp and 0 HD...
After 6 hours of light travel, dungeon exploration, camping, etc he is at (average) 22 hp, 0HD...
12 hours: 42 hp 0HD
18 hours: 44 hp 2d12 HD
24 hours 44 hp 4d12 HD
36 hours 44 hp 5d12 HD....
A 7th level wizard with 8 Con, 22 hp and 7d4 HD that is reduced to 2 hp and 0 HD:
1 X period: 13 hp, 0HD
2 X period: 19 hp, 2d4 HD
3 X period: 22 hp, 4d4 HD
4 X period: 22 hp, 6d4 HD
5 X period: 22 hp, 7d4 HD...or about 36 hours for fully recovering(if time=6 hours), a little quicker if you get a full rest.
What do I base this on?
To me, D&D is an heroic action adventure game...my expectations is a game that feels like an action adventure movie. The perfect example is a James Bond or Indiana Jones movie...(Indiana Jones and the Temple of Doom is a perfect example of an iconic D&D adventure). The heroes are frequently beaten within an inch of their lives...there is a feeling they are very much on death's door. The scene ends, the next scene there is some RP style interactions (talking to the village shaman about the stolen sacred stones and the kidnapped children) and then we're right back into fights, traps, puzzles...the heroes never seem like they are functioning at anything less than full hp from one scene to the next.
Call it H&S if you like (as opposed to "real RPGs").
I understand others want something a bit more grim. The rules should support that too. WotC is talking about dials...I look forward to seeing what they are...