The only real way to solve DPS queues

[JCharms]

No, other game simply resort to DPS burns, and when everyone can do damage, then there is no tank or healer, you just rely on consumables. Your wallet size ends up being the only obstacle to overcoming content.

Not really, other games without the trinity still have tanky and healy builds and are used, but not necessary if you have a lot of good dps so theres lots of variables, but all viable.

The problem is not that the roles exist, the problem is that people come to the game and have an entitled world view that they should be able to play the content without any teamwork. Hence you have annoying stupid things like green dps and ice mages because players want to play it in a way that it was not supposed to be played.

This is exactly the problem, its a very old trope now, and its simply the lack of vision and devs not knowing or unwilling to think outside the box. Though as you mentioned, the trinity here is a sort of hybrid anyway, its a pity they didnt keep going all the way with it.