Review: A Singular Empire | The National Interest. A review by Adrian Goldsworthy of Greg Woolf’s Rome: An Empire’s Story.
As interesting and difficult question as “Why did Rome fall?” perhaps more interesting, and no easier to answer is “Why did Rome survive for so long?”
Preaching Grace on the Square 
A fascinating review article. Thanks for posting it.
Dear Fr Jonathon
I do agree about your alternative question. I tried a quick answer at http://blog.oup.com/2012/05/how-did-roman-empire-last-greg-woolf/
best wishes
Greg