It's been a bit of a virtuous circle ....
Luckily that fear that all Empires have - that they will become flabby - is a reality. (Possibly letting slip my Gibbon support here). There will be very unpleasant times. But eventually the beast will eat itself.
However, be aware that empire watching is for people who find paint drying too racy*. It doesn't seem to follow that the bigger and more powerful the empire, the quicker it falls. In fact I would suggest one trigger for an empire demise occurs when the people involved start thinking of it as an empire.
Debates about when the Roman Empire fell can result in very heated discussions. In sandals.