Therefore, is Bitcoin a good global currency?

Estimates aren't accurate, but if it's 11 to 37% within just 16 years, how much more for the next 20, 30, 50, 70 years?

Or is this something that should be taken into consideration in designing an ideal currency? If the global population is continuously rising, hence the demand as well, yet the currency is continuously dwindling, does it not pose a serious problem in the decades or centuries to come?

Should the supply of an ideal global currency be dynamic, flexible, or elastic rather than fixed?