Whoa man you want them to step away from easy reskinnable hallway(trashmob)->small room(boss)->longer hallway(trashmob)->small room(boss) formula and try something new? you crazy

Anyway this idea came from a F2P MMO and maybe try adding bonuses, usually these bonuses were special bosses that were hidden or didnt show up in the quest log but during dungeons if you killed X number of mobs or collected X number of objects along the way or even just flipping a switch you would be given the option to fight a incredibly tough boss usually located somewhere off the path of the dungeon and it would drop rarer loot then what the dungeon gives, I always remember hearing the phrase during every dungeon run "Are we gonna do the Bonus?" it was always a mixed answer because of the difficulty the bonus bosses proved.

implementing this wouldnt drastically change the format nor would it impact players "Wanna do the Bonus" "No" "k"(exit). I dont think we can take the cookie cutter from this Sub-Based MMO and get them to try innovate