You know what's a very easy fix.... Just add another hunt category, daily hunt for dungeon boss monster or primal boss. You need to kill ALL bosses in the dungeon to get final reward of 40 seals and one time daily bonus of 100 myth and 20 soldiery on top of you normal dungeon bonus and duty roulette bonus. You can get up to 3 daily hunt for dungeon monster - random dungeon and primal hunts will be posted on each grand company with one weekly hunt from LA and SC (that has a bit more rewards).

This way, if you don't want to deal with the mess that is NM Hunt, you can do the daily Dungeon Boss hunt and Primal hunt - get your seals the old fashioned way (but time wise - its comparable if you spam your normal hunting fest). Problem solved, more people will do Duty Finder Roulette since now they can get a more fixed reward. 120 seals per day is not a lot for doing three dungeon hunts.