Well really...it's said that (besides a shotgun to the face) the best way to counter a super is with another super. And...I've popped my bubble to save my team from an incoming nova bomb before. So, a warlock should be able to shatter the bubble to get to the titan stealing their base. And it's not like us having our bubbles popped kills us. We just kinda stand there. And go "Oh...I guess I have to fight again." I've killed my bubble poppers. And they've killed me. I think the Ward of Dawn is fine as is. (And have you had it popped in PVE? I didn't think so.)