You would be amazed by what a simple buff to the output of Q would do. The only reason its no longer Meta was because of the nerf to the healing output. Yes, it struggled against comps with purge but teams skilled with nature staves could still adapt and win.
t4 should heal 90 at 3 stacks, t5 should be 95, t6 should be 100, t7 should be 105, and t8 should be 110. That should be the BASE healing output of the Q stacks (at 3 stacks with a Mage Robe on for 50% bonus). Then it should scale with Item power/specializations from there. That simple buff would put Nature back in action. I'd bet my account on it