Bitcoin is highly important. The first cryptocurrency that the blockchain technology gave birth to was bitcoin and that is what totally make bitcoin different and why other coins are totally classified as altcoins and that is what they will always be, no matter how the bankers try to push a centralized bullshit up if you know what I am saying. Bitcoin serves as the main one that other coins just decided to build on.
In my opinion, bitcoin is important in the blockchain world because it is the entry why the blockchain technology has been in creation thus it is considered to be significant. Since bitcoin is the most popular with a very high currency value, blockchain will be able to offer its platform in the world using the new technology to build a good financial system.