Losing Aero and Blizzard 2 will be a mild DPS nerf for SCH as things stand. No stoneskin could be considered a nerf for AST in particular (I'll certainly miss it).

I suspect it's very quickly going to turn into a cookie cutter situation. I can see myself almost guaranteed to just roll with Prot/Lucid/DS/Esuna/E4E or Virus and maybe switching esuna out for cleric where it's relevant if I actually remember to (and then promptly getting someone killed because I forgot to switch back and couldn't dispel doom )