Originally Posted by
Socronoss
Nope they aren't.
People doing it for loot will now form a guild group of 5. Play a +10 in 3-chest time, go into the new dungeon, put key in, reset (x3), then play the next +10 in 3-chest time. Rinse, repeat. You now effectively have removed the need to rely on other people's keys, so you can purely farm in your own 5-man group. EDIT: for clarity, +10 is in today's world. If max moved to +15, then it's the same on that level.
People doing it for prestige will still run high keys in their 5-man group. No change, except for maybe more loot for them, but mostly, they are the ones that don't need the loot anyway, except titanforged.
People farming AP will do the same as the first group, just prioritize the "long" dungeons (HoV, Arc). The additional AP you get in higher keys is just not worth the additional time you spend on them.