There needs to be a way to remove dungeons from roulette?

[Awha]

Yes, just like the trials roulette is still a roulette despite not including Amaurot. Letting players avoid specific dungeons isn't going to cause the entire system to collapse. Participation may even increase if people didn't have to worry about being placed in their least favorite content. If certain dungeons are really despised by the majority, a separate option could be added to the duty finder to prioritize queuing into first timer dungeons or unpopular dungeons in return for more XP/tomes/whatever.

Isn't the point of the roulette to help people to fill up content that would normally not get people?