Super Hard Mode -- Are there not already areas with level 99 mobs? One could try clearing those!
Super Super Hard Mode -- NMs hit you for 9999 damage the moment you zone in. (You wanted a challenge yes? ^^

If they do a super hard mode, I hope it is not made 'hard' by introducing more lag or being more picky on requiring you to stand in even smaller 'safe spots', or decreasing drop rate from 1% to 0.001%.

It can be challenging to introduce a super hard mode without making it silly. Am curious what people think/want when they hear 'super hard mode'.