I'd actually like to see something like Shake it Off's purification, but done as a trait, like so:

For every Gauge spent, you gain a 1% reduction to the duration of status effect against you, fading over 5 seconds.

Double Fell Cleave / Inner Beast -> 90% reduction to status effects against you. Toss in an oGCD, and you're at 100% reduction / complete immunity for 2 seconds.