It's amazing how we talk about the effect of 3D before vs after summer.
Before it's all about the decline of the fad, and how they don't really affect numbers that much(see marvel films last summer).
After Summer it's, well things would be very different without 3D and all that....
I'll say this, James Cameron did what he always does. Game Changed. 3D is a factor and even Nolan will bow before it's might lol. But the films have to be able to make a claim. (ala Avengers, Avatar, TF3...even Pirates.)
I hope we all keep this in mind when predicting Spiderman's take from now on.