I really hope that rather than straight up nerfing warlocks, they find some kind of endgame niche for them. Hunters can go invisible or tether enemies for CC/Damage boost, Titans can throw down bubbles that give huge stat boosts or run around throwing hammers at targets, wrecking everything. Warlocks? All they can really do is hold a self-res in reserve (which really contributes nothing to the team, a super that you use more often is much more useful), chuck a relatively small radius bomb, or runaround with a close range CC attack. The more contributing thing they can do is the Sunsinger ability that speed up recharge rate for all allies, and even that isn't extremely useful since most people use guns instead of grenades/melee.