The lack of reading comprehension skills of some players had me abandoning this thread for a bit, but I thought I would pop back in since it is still alive. Welcome to the forums
Casters are not dead, despite my initial supposition. Just wizards are (and those without max DC's). Most of my initial thoughts in this thread were based off playing my wizard, since due to spell versatility, he was the easy choice to take into new content first. The lack of spells sticking made him obsolete to really accomplish much. Since then, I have run both my sorcs more through the new stuff (one conjuration spec'd and one enchantment spec'd).
The conjuration spec'd sorc is rocking. Web + Trap the Soul => Win. However, the wizard would not be able to accomplish as much as the sorc. Where this sorc used to only need one really awesome web to hold mobs, now I typically would want 3-4 if I want them all to stick. The sorc mana pool therefore becomes more relevant - and wizard "versatility" is left behind since I'm primarily only using a couple spells (those I'm focused in) anyway.
The enchantment sorc is lagging behind a little bit. Mass hold monster is not the cure-all I thought it would be, although mass charm monster isn't too bad, it doesn't last long. I've actually found myself nuking a bit more as well. Traditionally, I always preferred more CC spec'd sorcs to nuker builds, but the lower HP in some of the new stuff does make some old school AOE's useful again.