This is a common trope people like to throw around, but for all practical intents and purposes it's not actually true. Each Bitcoin is divided into 100 million Satoshis. At current market price, this means you can divide each Bitcoin up into slices 0.05 cents thin. There is no scarcity, at least not for any reasonable time frame in our lifetime. Add to that the fact that many brokers today offer fractional shares on a lot of securities already and you can probably see where I'm going with this. You will always be able to buy however small of a fraction of a Bitcoin that you want.