CapnZapp
Legend
Sorry but while this sounds all fine and dandy, you have now completely and conveniently left out the entire 6-8 encounter ballyhoo out of your discussion.This is because resting early isn't a mechanical problem. No mechanics are entirely going to stop it. You can't expect a rule patch to fix a social issue. If one player is being abusive to another, or a player is metagaming, or one player is optimized by the others aren't, or one player spends all their time on their smartphone then turning to the rulebook won't solve anything. There's nothing in the DMG, no house rule or narrative fix, that will solve the Facebook issue.
The issue exists at the table with the players, and in the unfolding narrative, and the solution needs to take place at the same level.
Comparing this to Facebook - hah! WotC should hire you as a PR agent for why they're supposed to get away with setting up conditions for a balanced game but then not have to burden any of the responsibility for meeting said conditions. (So high points all around. The bit about abuse was entirely poor taste, though.)
The bit where you say "no mechanics are entirely going to stop it" intrigues me however. First off, I never claimed I expected a full 100% fool-proof solution, so this is a poor argument for doing nothing.
But what mechanics do you feel will at least partially discourage resting...?