A bit too specific for a reasonable expectation to express, but I agree with most of your underlying suggestions.

A few things from me:

BLM is fine with just primarily fire/thunder/ice. The no penalty thing for what I assume is regarding water/stone/aero is unnecessary. Leave those to WHM.

I hope for more creative magic effects and skill design than what you have listed out.

Though we can agree current BLM is not okay. Though I think after MNK it's the most changing job so I suspect we'll be pleased.