I would love it to be harder as well as better rewarded due to difficulty.

Adding a NM or HNM as a boss will be a good fight,
or we get teled to a randomize mini instance where there are some puzzles/mobs in there.

Propose to add some blueprints for unique stuff which can only be crafted X times and the blueprint go poof!
( Ppl who played eve online should know :P )