There are two groups of people. Those who spent their BTC no matter the price and those who try to avoid using their bitcoins which isn't good. If the vast majority of Bitcoin users decided not to spend their BTC then hardly anyone would be interested in accepting Bitcoin as a payment. There would be people who would like to sell bitcoins (miners, investors) but it doesn't matterif there is no liquidity. Gold and silver is very popular in any country and can be easily exchanged to fiat in certain points.