Queueing As a Role, not a Class.

[MyaValentine]

Poptart.

And then someone easily switches back to War, not that hard. Don't make it more complicated than it really is. Rather just queueing as a class, you queue as a roll - DPS, HEALER, TANK., the only problems there would really be, is problems someone creates himself, other than that it should always work out just as it does now (minus the few people who purposely create problems because that's what people do).
Here's something that happened to me the other day that made no sense, and this could've fixed it.

I set up my Ninja class on my bf's ps4 (I always play on my own PS4), and then queued up for a dungeon; forgot to put in my soul stone - and it was a 20 minute queue, so I'm not just gonna unqueue and requeue. I couldn't even go in as a ninja, I had to do it strictly as a Rogue - very annoying and makes no sense, it's virtually the same class.