Bitcoin is already a global currency in the terms of cryptocurrencies. Agreed.
USD is the only global currency atm tho.
LOL, Bitcoin can't replace USD, Bitcoin still a baby. i'm not sure Bitcoin can be a real global currency, it's just alt currency but it will big and will be a global alternative currency. the fact is there are still a lot people still choose a paypal than bitcoin, it's prove if Bitcoin can't replace fiat, but it became a global alternative currency.
Bitcoin is a baby but it has started to walk

, i see especially my friends time by time are more interested about bitcoin but as anyone are afraid to invest because of decline. Fiat has it own place and can't be replaced by bitcoin but online bitcoin is competitive.
the best time to invest actually is when there is decline, a few weeks and there will be the same bubbles, same increase and decline and the cycle keeps repeating itself, its an investment and its volatile. Time to deal with it and make better choices than rant on forums question speculation graphs and authenticity of statistics.. Its not that complicated, man