Those changes wouldn't be anywhere near enough and flat out ruins the identity of the class.

OGCD Thunder in particular is lazy design. BLM is not about OGCD damage. Mana ward's changes while strong, wouldn't be unique enough to be essential and even if it was, would just lead to the same problem RDM has.

The Ley Lines buff wouldn't be worthwhile because people only run 1 caster, and the only casters that scale well from attack speed gains are black mages.