They should just add something to the T8 versions of the Druid single target stat buffs. For Furies, it could be something like 10% spell resistablity to their INT buff. For Wardens, it could be like an uncontested 20% chance to resists hostile effects, whether they're DoTs, control effects, or hourglasses (Trakanon 
).
Those buffs were valuable in lower tiers, so adding something to the T8 versions to make them worthwhile makes sense to me.