In light of the release of the Epic SoS and the recent "nerf wall of fire" threads, I decided to post this.
Epic upgrades for spell casters (with the notable exception of the Epic SSR) have been nothing less than (for lack of a better word) pathetic. Superior Lightning Lore on a cloak? Minor Spell Penetration IX? Greater Necro/Enchant focus? Consider me unimpressed.
Compare this to Epic Xuum or Epic SoS, which in the latter case has somewhere around a 20% higher DPS (just an approximation, go ahead and correct me if you want) than non-epics.
Also, let us compare caster PrE's to others. So far all we have is Pale Master, which in its current nerfed-to-oblivion form is a joke compared to Kensei and Frenzied Bezerker.
Turbine, you need to firstly fix Pale Master. Secondly, we need to see some comparable PrE options to other classes. Thirdly, from what I am seeing with epic items there needs to be something useful implemented besides the Epic SSR.
In light of the currently released Epic SoS, I actually am in favor of deleting the "nerf wall of fire" threads completely and going all in with elemental substitution. A 20th level caster is supposed to be able to shape reality to his whims. While I'm not expecting quite that much power, give us something to do besides use level 3 spells to haste and displace the rest of the party as an optimal tactic.