GMforPowergamers
Legend
I would love an opt in (through subclass or something) metacurrency, and martials that grow to mythic levels as at least close to a caster.I'm fine with mythic martials at appropriate levels, I'm fine with metacurrency as long as it's not built into the structure of the core game (maybe on a class or archetype basis), but I don't think a hard nerf to casters is the answer, and I'm virtually certain it would not be acceptable by either WotC or a significant portion of the D&D population.
As for the nerf to spells, I would take some clues from 2e here... like haste ages you ext...