It seems to me that holding large amounts of cash is only viable when inflation stays low. So a higher level of inflation might cause the release of some of these huge cash reserves in the form of real investment (real in terms of hands doing work instead of moving the cash to some other financial instrument)...
I mean, cash doesn't need to literally be a pile of money right? It could be in some kind of ultra short term instrument that has some kind of inflation protection. Normal people could buy t-bonds to exactly match inflation. Not sure what options are out there when you have 100 billion dollars - but something like interest rate futures could hedge you against inflation risk.
Inflation goes hand in hand with growth, you can't hedge away changes in real value. If cash can be put to productive use, people who hoard it will do less well than those who put it to work.
