I don't think it's been confirmed we won't have one, but it's too soon for one anyways. Maybe mid 5.3 or 5.4?

Trusts are a form of leveling but they're way too slow and time consuming to be a comparative method, so I doubt we won't get a deep dungeon because we already have trusts (unless they massively increase the XP gain, give the NPCs an AoE rotation, and also boost their overall damage)