Seeing how popular Frostfall and Realistic Needs and Diseases is, not to mention all the survival games popping up on steam every 2 seconds i think it's likely they'll add a hardcoe mode in the next game.
Personally i think it adds another level to the gameplay, atleast in a climate like Skyrim, i don't really use those kinds of mods for Morrowind or Oblivion but i just need to have them when i play Skyrim. Situations pop up like when you're stuck in a blizzard in the Pale, no wood ,little food and need to take shelter in a dungeon you might have otherwise overlooked or die adds another layer of immersion and fun.
But for many it would just be a chore.