I suspect you are making a snide comment, but it is an interesting idea to roll around. The big difference I see is that people aren't forced to measure things in crypto. Your local tax office will get antsy if you don't trade in your local currency. If the local tax office required things to be measured vs "crypto" then the rate of new cryptocurrencies being created would become a very important measure indeed (although they aren't going to do that - they'd pick a specific blockchain to reference).

People already measure the amount of crypto that is registered in a block chain which effectively is counting the money supply. It is an interesting metric.

As an aside, take note that the value of something like Bitcoin is actually proving quite stable so far. This last downward collapse hasn't even been a dire crash by its historic standards. Yet, anyway. We haven't seen any signs of an implosion that would be comparable to the hyperinflation death spirals in fiat.