I like that we are brainstorming changes for improving mage QoL but these two would not work out so well imo. The first change would make the fire mage rotation so static it would be mind numbing. It would almost always be: Fireballx2, Inferno Blast, Pyroblast, refreshing bomb when appropriate. Unless both Fireballs crit, you would never vary your rotation. The second one is such a radical change, it would require a truck load of changes to support it. What about Arcane brilliance? It would then give 10% spellpower plus 5% spellpower. Molten Armor? 5% spellpower. Those buffs are now redundant, boring, and most importantly ridiculously OP. They could be toned down, but that only addresses one of the issues. Always having 40% crit would make gearing and theorycrafting incredibly boring and the spec in general would be far worse off.
Again, I like the fact that we are throwing ideas out there. I'm not trying to piss in your Kool-Aid, just thought I would point out some of the reasons that wouldn't work.