Matchmaking without the Trinity: how would you do it?

[Telsyr]

The only solution I see would be to re-think the dungeons and add a 5 member with a support slot like Rift did (they have 5 men team instead of 4).
Considering the amount of work it would be to balance everything I would go with

Except that it would take even more work and time to balance everything around 5 people, including older content.. they would have to change everything to fit the new style of 5/10/30 Meaning tacking MORE HP to already over inflated bullet sponge bosses we already have. More damage from bosses means each tank class has to be re-balanced to be able stand their ground and all DPS get a nerf due to adding more roles and the fact that support increases DPS all around.

Tank, Damage, Healing, Support.

I can just smell those 1-3 hour 4-man queues now. Thats only for healers.. DPS will be worse as we'll be waiting for all those supports, that are going to be rarer than tanks, to show up.