To sum it up, too much paper simply means too little power (left)
There are a couple of ways to look at this...
One perspective is that financial asset inflation by itself creates instability and thus weakness in imperial system, everything else being equal. The reason is that, as private investors look at an increasing total amount of financial claims issued, they have to worry about the value of those claims and whether they want to hold on to them, while knowing other investors are thinking the same thing.
On this count, while the system is stable, the combination of imperial economic size and manipulative power would have to increase, indefinitely, in order to continue to contain the instability indefinitely. The history of global empires shows that asset inflation always eventually outpaces these factors of stability. (Which would be consistent with my argument that the problem lies in the incentives faced by individual members of the elites.) This is not to mention that a good part of modern imperial power is 'soft,' ie based on the perception that the imperial state is singularly respectful of market forces and will not do the things it actually has to do to contain the instability. At some point, this fundamental deception is exposed.
Another perspective is that asset inflation weakens the social, institutional, and individual strengths within the imperial power. As members of the imperial elites and citizenry enjoy unearned power and wealth through creating financial assets trusted by the rest of the world, the wrong behavioral incentives begin to pervade their entire system. People and institutions weaken because problems can be 'solved' by creating assets out of thin air. (This is pretty much the sad story of the US.)
All of these factors of instability reinforce each other. What we are left with, then, is an inescapable path to decline.