When people talk about Bitcoin price, they usually refer to its price expressed in dollars. I really don't understand why...
US Dollar is going down in price, US economy is collapsing. There are many other countries which has more Bitcoin users, like Russia, China, Japan, Philippines and the whole Eurozone. Even ICOs are forbidden in the USA. It's not a so Bitcoin-friendly country, its national currency is not so strong. So why price Bitcoin in $?
There could be many other more appropriate currencies like EUR, CNY or RUB...
Yes there are many currencies you can compare to but they compare bitcoin to dollars just because dollar is like English which English is the universal language. Dollars is the most important currency because it is the main comparisons for all currencies like here in Philippines which know the stock market they compare the value of peso and dollars and what have been changed day by day, but it doesn't mean that other currencies can not be compared to bitcoin. It is just that for uniformity purposes, people uses dollars to compare the value of bitcoin.