Someone may be kind enough to hint to you that your Shorts will be paid in that "fiat system"'s currency. One wonders if your goals are therefore contradictory. No, when you short, it is treated like any other sale. You are paid in fiat. Naturally, one can trade the fiat for something more, stable.
Fiat and bonds are useful in the transition to deflation, but may need to be abandoned when the Feds come to the "rescue".
If fiat is destroyed you won't be dancing in the streets but you may very well be running for your life.