Bitcoin is going 9yrs old, so far no alts surpasses Bitcoin. For 9yrs it remains the king. While Bitcoin is going down, no alts remains strong. All alts are crashing too. This is the best indication that Bitcoin has no replacement.
Yes. I am totally agree with you. Bitcoin can not be outdated, do you think it will continue for 9years if it will replace by other currency. As time goes by, bitcoin grow and usable in may transactions. I assure that it could last so many years and it will grow bigger and bigger. Even if there has many cryptocurrency creating everyday, but as of now , there is no cryptocurrency exist or can beat Bitcoin.