Rome didn't run out of money, it ran out of Romans in Legions. It is the kind of thing that happens to any Imperial Status Quo.
I wouldn't be at all surprised if they resorted to a draft of some kind.
and the darkness took them. Hi Greece! Do you want fries and a Coke with your darkness?
As usual, nobody in Greece is going to notice as they slip into the abyss. They are all utterly reliable.