Sill, even with Shadow Evocation, the quasi-reality issue and reduced spell level per spell slots kinda hurts. Is it really worth it? Then again, Planar Binding a Skurid (aka: Shadow Squirrel) from the Plane of Shadow and casting Greater Planar Bubble on it allow for additional quasireality and free maximization to Shadow Evocations and Conjurations anyway.
I'm also really fond of Enchantment and loathe to give it up. Freezing Glare/Glance is just too awesome and can be persisted and shared with my familiar. Plus, awesome spells like Irressistable Dance and Maddening Screams are too awesome to give up.
I guess my real consideration here is whether or not there are spells from necromancy (which I don't already have) that I cannot benefit from unless cast by myself. As I see it, I've already learned everything that I need to cast myself. I already have Shivering Touch, Skull Watch, Shivering Touch, Specral Hand, False Life, Ray of Enfeeblement, Ray of Exhaustion, Mass Curse of Impending Blades, Vampiric Touch, Ray of Weakness, and False Life.
Everything else can be left to the dedicated Necromancer in the party. He can make a Clone of me and he can take me along when he Astral Projects. Also, as a Pale Master, his summoning abilities will always surpass mine anyway, so why not just leave it up to him?
Although, Sword of Darkness will be missed. No saving throw, negative levels per attack with iterative attacks is pretty awesome. And Enervation and other negative level imparting effects will also be a huge loss. I don't know. I'm still on the fence here.
In case I'd like to keep both, is there any other school that's droppable? Also, another query, since I have Spontaneous Divination and know all Divination spells the moment I have access to them anyway, can I actually drop Divination?