To this day, I still don't understand what our current stadium lacks beyond maybe a party area where people can congregate, grab some concessions and watch the game.
In terms of actually serving it's purpose of being a functional venue for watching an NFL game it's most certainly adequate.
What will a new stadium have that the current one doesn't, and of those offerings/amenities which could not be incorporated into the existing facility? I'm not sure I've ever heard a reasonable response to that.