I think what you're going to see next patch is either
-A buff to Sbolt, since the two Sbolt using specs are distinctly lagging behind destro, and destro is the least affected by their low-stat mantra.
-Or more likely a nerf to destro, because IIRC aff and demo are closer to each other than to destro.
Notes:
-Molten core is definitely noticeable for PvE. It's a nice spike of damage.
-Demo should be beating the pants off of Aff with the large DS nerf and complete lack of compensation. They just lost ~7-9% of their dps.
As for what demo needs:
-A slight buff to immolate duration so that you don't have to cast Hog the second it comes off CD(or make fel flame only a slight dps loss to Sbolt, not the useless spell it apparently is now.)
-They need to figure something out for decimation. Last I checked it was actually a dps loss for me(emberstorm should fix that by 82) but that doesn't solve the meta CD reduction issue removing Sbolt from rotation introduces.