Nerfing the facility would not cause people to stop farming lore. They would farm the next best thing and in the end you solved nothing plus made a mess.
What i am suggesting is putting facility in no roulette at all. I'm pretty sure that was how it was in 3.0. Also with all the people farming it i don't see how people needing to do it for story would have any trouble getting a group.
EDIT: I think this problem is real and SE would like to look into it.
When 3.4 hit i didn't have expert unlocked and 60 roulette was locked because of that. You need all the dungeons to unlock 60 roulette in 3.4.
