As a 50 SCH doing the Coil, I will weigh in. First off, SCH are much better tank healers than WHM. If tanks in the coil aren't screaming for a scholar to heal them they are idiots. In order for a WHM to have the same effect on their tank, they have to first top the tank up, then cast stoneskin. 2 casts for the same effect as a single SCH cast. Wait till the first boss in the coil when each tank is getting hit for 25-30% every 3 seconds and see which class is the better tank healer. Especially considering WHM's can't regen mp as well as SCH.

If they improved Succor, it would make SCH to good compared to WHM. As it is Succor is awesome for what it does if played correctly with a WHM. The Scholar should always be on the MT, succor should be used as a supplement to shield the raid while a WHM does Medica/2 to top the raid off.

No class is best at everything, which an improvement to succor would do just that.