I would love it if you added a raid difficulty that is similar to (or exactly the same as) day 1-2 contest difficulty. I'm not sure what the rewards should be, but at least give them adepts, but don't add the contest emblems as a reward, those should stay exclusive.
To all the people who complain about hard content, this wouldn't replace any of the difficulty options, but should instead be a new difficulty.
-
In FFXIV you can do a minimum ilvl option for all content this is essentially contest mode from the day it released. Destiny should give this option to players who seek this type of challenge for all content in the game.