I think by 2030 or maybe later the price of bitcoin will be 3000$+ or the trend of bitcoin will get over. Now i really don't understand why do people want bitcoin as a currency i don't know if you are aware but there can be a total of 21 million bitcoin and 14 million is already mined so technically it can't be a currency as there won't be any bitcoins left to distribute and if that happens then calling butcoin next gold won't make any sense
Bitcoin is assumed to be infinitely divisible
So there is no reason to think that there won't be enough bitcoins to use it as a currency. In fact, there will always be enough money to facilitate the exchange of goods since whatever the amount of money is available for circulation (provided the unit of money can be easily divided into subunits), it will be balanced with the amount of goods traded through price (less coins higher the price). In practice, that may and will certainly cause a host of other problems but these won't be related to this issue as such