Your argument is:
"Why would anyone spend any money if it's worth tomorrow?!"
to support a pro-inflation argument
The counterargument / parallel reality in an inflationary world is:
"Why would anyone accept any money if it's worth less tomorrow?!"
The only difference between the two paradigms is that in the later, the currency creators have the power and in the former, the currency owners have the power. It is no coincidence that the financial institution has chosen to be in control of inflation and extract the wealth first, via seignorage, of currency inflation.