You don't understand the point here. The price cannot drop forever, someone will try to make the price go up, because if they don't,everyone who has bought bitcoin at any point will go into a big loss. Miners won't be the main crowd that'd get affected, the investors would be the main crowd obviously. If the price keeps going down, it would be implied that there's not enough demand for it, and the supply is more than the market demand. If there's no demand, the price won't fall,because no one will buy.