In the interest of crushing your dreams I'd remind you that the primary use of Ward of Dawn, and what made it an invaluable part of any Raid, was that it was a dispenser for Weapons of Light and the occasional Blessings of Light. That job has been taken over by the Warlock. The Sentinel bubble is nothing but a defensive bubble. It's just a wall between you and your enemies. It may still be useful in PvP, but for PvE, well. When's the last time you let someone use Armor of Light in your Raid?