Bitcoin blockchain is a public system. It provides privacy that I think is more essential than anonymity. In blockchain you can find only the address of bitcoin user, so you’ll need to use additional resources to identify the personality. This is a sort of anonymity that I think is quite sufficient to satisfy users. The main idea of bitcoin is not the anonymity but decentralized system and transparency. If someone concerns about anonymity there are such altcoins as Monero, Dash and Zash that provide it.