I thought the field collapsing was silly and unnecessary; my only thought is that the Batcave is under it and Bane wants to expose it, but even then, it is over the top. I think blowing a hole in Arkham was dramatic enough. My big hope is that Nolan has Bane break Batman's back ala Knightfall and the rest of Gotham is forced to "rise" to stop crime on their own.
I disagree about the theme; anger against the super rich and their profiting while the rest of America is suffering is at a peak right now and Nolan is going to play on that. Maybe the "99%" of Gotham is being overrun by crime while the rich are dancing at a posh party?
If you get the chance, get the Knightfall TPB. I have always collected Marvel comics, but way-back-when, I bought the Knightfall series and it was a good read. The Vengeance of Bane one shot is good as well.
https://www.amazon.com/Batman-Knightfall-Part-One-Broken/dp/1563891425