The right analogy, it is true that Bitcoin is difficult to replace by Altcoins because in terms of performance Bitcoin is far superior to Altcoins. Besides that, the popularity of Bitcoin as the first crypto that exists is also an attraction for some people who like popularity. Moreover, the fantastic value of Bitcoin Of course, many people are more after Bitcoin than Altcoins. People's fears if BItcoin suddenly disappears also began to be buried because it can be proven that until now BItoin can still survive even its performance is considered to be getting better every year, so I also think Bitcoin has a longer period of time than some Altcoins that often appear but suddenly just stuck even disappear.