Not to be a debbie downer or anything, but this seems like it could lead to some complications with the given state of DF queues.

1. Most people still want to just be DPS, so you'd almost always be getting into your queue on all three roles, only to wind up in tank or healer almost exclusively.

2. If lot of people multi-role queue, then there's a concern that people who cannot multi-role queue would be at a disadvantage for queue times. Even if there's no actual issue with the queues themselves from introducing multi-role queue, there'd be a controversy from the players who don't want to level or play more than one role/class.

3. I'm not sure how the game would put you into the queue in a way that works. Say you queue for all 3 roles. It puts you in party 1 as a Tank, party 2 as a healer, and party 5 as a DPS. Whichever party fills first is the one you'd go in on, but wouldn't the party that fills first be the first party in the queue for said DF thing? Meaning, you just wind up queuing as what is in need or whatever, more often than not, kind of defeating the purpose of having the feature, no? Maybe I'm wrong, but that's just the way my brain's parsing the idea.

4. Given that multiple multi-role people would be queuing, how would the game decide what role to make each person if 4~8 multi role queued individuals all wind up in the same party?

Honestly I find the idea intriguing, but I think it'd just over complicate things and possibly break the system.