Sadras
Legend
1. Tie ability recharges to level up. For example spell slots only recharge on level up. Obviously the number of slots needs increased but that should be doable.
Well that would depend on how often a table levels up, right? If a table enjoys a long slog between levels then this would not be a welcoming house rule.
2. Keep healing and hit die mechanics tied to resting - potentially also slow the rate at which you heal through resting.
You're suggesting no in-combat healing? I can see this would make combat more deadly... but I'm not sure how this would change how far the party is willing to carry-on in a day.
Does this solve the 5MWD issue?
5e (from my experience) doesn't seem to have a 5MWD problem.
So your thinking is the player will want to refresh his characters' spell slots sooner and will urge party members to push thus eliminating supposed 5MWD's. I'm not convinced this is the way to go if you want to encourage players to keep pushing.