As a personal holder of a number of Crypto's and a trader and investor of multiple assets for many years, the short answer is "NO" unfortunately.
Neither digital currency nor the fiat currency in your pocket are a store of value.
Dollars, Euro's, Yen etc are little more than a promise to pay.
Should the issuing Central Bank default, it no longer has to keep its promise to pay, so that 100 units of currency in your pocket will become worthless.
So why is Bitcoin(BTC) worth $4,500? because people are willing to pay that much for them (Demand) though a very small percentage of BTC is used in transactions for goods and services, the rest is speculation.
So what would happen if this Demand was reduced/removed because of unanticipated factors?
The price would naturally fall to reflect the increase in availability (Supply).
Is a valuation of Zero possible? For anything that's not a store of value, Yes. This includes Fiat Currencies, Bonds, Equities, etc.
A true store of value is anything that cannot fall to zero. Something that will always be in a varying degree of demand irrelevant of circumstances.
Gold, sliver, palladium, platinum, etc.
Keep this in mind when calculating your risk exposure.
@philcasey