There is one glaring error in this chapter.
How was Draco Malfoy tortured for two days by Voldermort if Voldie had been slain by Harry's SEALs?
Other than that, for some reason the ending seemed rushed. True, I think that bringing the end of the wizarding world about via total economic collapse is a good idea, but I'd think that the ministry would be able to break into the bank. After all, Goblin Rebellions are all Binns talks about, so I'm sure the ministry has some contingency plan for such an event to get into Gringotts. Now moving the money out of the country while the ministry is taking too long putting that plan into action because of Fudge's incompentance would be more believable.
Speaking of which, I expected another "goblin rebellion" in response to those laws, not a simple shut-down of the bank.