If the idea is to give spotlight to RDM's enhancing powers, you don't do that by maintaining the status quo.

As far as how high it should go, what do you think should be the limit? Our Enhancing spells were just barely formidable at 75, I'd like to see boosts that allows a RDM to stand it's ground against Proto-Omega or Odin. And yes, current equipment that that supports Phalanx, Stoneskin, Bar-element, etc., would naturally continue to apply.

Being able to take a beating the way RDM is known for doesn't include better hate tools, nor more powerful DoTs, so there's no fear of RDM soloing 80+ event mobs or out-tanking NIN or PLD (and eventually RNF). What's to worry about?