Peter,
I understand from a German pilot friend that the German magazine "pilot und flugzeug" has published an article saying the Italians will be "clamping" aircraft after the 48hr point, to prevent them flying away.
Actually, I'd like to see them try that, preferrably to a bunch of large biz jets with VIP's on. Not because I'd like to see them hassled but because it will cause an international incident of quite some proportions which might well put an end to this very fast.
Imagine the headlines: "XXX taken hostage by Italian government".