All other arguments aside, one can understand why many Catholics doubt this vision was fulfilled in the unsuccessful assassination attempt against Pope JPII. The scenario you paint is likely closer to the reality than the explanation offered by the Vatican in 2000.
And that is what scares me.
The koran also speaks of the devastation of the throne of the crusaders that's located in the heart of Italia
While I fear that these obvious allusions to Rome are just the ravings of desert madmen, I worry that these remain future events that will someday come to pass.