Rome's collapse was over 100 years. The USA is the modern Rome and it's collapse is a slow motion train wreck. It is impossible to say when, save for if you are capable of spotting the beginning of hyperinflation as it occurs.
Now, as I have stated - I am not a hyperinflationist. (Although I conceed it could happen).
My stated outcome is that of massive systemic devaluation, done in coordination throughout the Western world. My view is that the interconnectedness of Western balance sheets means that once the banking system as a whole truly starts to go down, there will be a system wide shut down. Western Governments will coordinate a full fledged recapitalization of the banking system; done in unison to "harmonize" the Western world and it's trading avenues.
This is far more plausible to me then hyperinflation.
A hyperinflation would, in my view, lead to a MASSIVE starvation and culling of the herd. Since the current order requires "growth" to maintain it's profit structure - a culling of the herd is not in line with their models of control. They want control over HUMAN LIVESTOCK. More human livestock = more resources created for the benefit of the masters.
The masses will be tested and raped - and then re-pacified.