Of course the best thing they could do is give utility to WHM while moving the other healer's DPS up more, but SE seems hell bent on not doing this, they believe WHM alone should never have utility so here we are.
Utility only gets stronger as ilv goes up, so what chain strategem is like now will be a lot different in about a couple months.
What I'm saying is that if they buff SCH and AST personal DPS now, WHM will have lost the only damage "utility" they bring to the raid and we'll then have to wonder if WHMs healing is worth it alone to bring them over an AST or SCH, abd I really doubt be it will be.