USD is useful because you can pay taxes with it, equities represent an income stream as dividends from a (presumably) successful business, gold can make jewellery etc, land can be rented out.
Even the supposed utility of BTC - as a money transfer mechanism - does not require the price to be anything other that not zero.
Even the supposed utility of BTC - as a money transfer mechanism - does not require the price to be anything other that not zero.