I think the price is all that matter. Peace
It is the only big reason why traders like to trade on bitcoin vs altcoin and bitcoin vs fiat. However it has a downside, if the price falls too much people may convert all bitcoin to fiat and stop using bitcoin. However the chance is very less.
I dont think people will convert all bitcoins to fiat if the price falls but there are people always waiting for the price to drop so that they can buy more bitcoins because they believe it will grow again and they will earn profits with it, and that is why price matters in bitcoin.