What if bitcoin gains much more value than you anticipate? So what happens when 1 satoshi reaches the price of 1 dollar?
What kind of arrangement is made if payment is requested as Cent? Can the bitcoin core be modified?
The only thing that could make it happen would be a collapse in the economy, something unprecedented. In this case there would be a chance that fiat currencies would lose much value, and people would migrate to a more efficient currency. But as we all know, the Bitcoin network is not yet ready to deal with such traffic.
While the economies will need to collapse to see that kind of price, it is not as difficult to believe since the economies are as vulnerable as they have ever been, so while it is unlikely, it is possible.