Sorry about your accident. A Back end picture is really needed tho. From the picture you posted its hard to see the full extent of the damage. As long as you are OK & nobody was injured the car should be easily replaced. If you have a major insurance company things should be looking brighter for you very soon.
Really depends. If there is frame damage, I think some insurance company will write off that car.
I have seen similar damages recently (not on an accord) and the repair estimate was $8k easy. But still, that shouldn't be enough to completely write off a (relatively) new Accord. But again, if the frame is damaged, then that would be another story.