Maybe in 5.0 we get Divine Bension II which is the AOE version? That would work I think too, but of course WM still would be getting it a lot later than other classes as Nocturnal Sect is a 50 and for Scholar Adloquium is 30 with Succor 35. Getting WM's first and only shield right now is at 66, but it is more powerful than stoneskin was.

This in a way may be what I'd prefer to have happen to shield for the big AOE's when solo healing in having something as powerful as Divine Bension and a shield of 15% of targets HP instead of 15% of damage. On a tank with 70k HP that is 10.5k damage absorbed.