Bitcoin has been introduced on its own and blockchain system at a time, there are some basic reasons behind this argument. Bitcoin also introduced the cryptocurrency to the whole world, people first knew about Bitcoin and then other cryptocurrencies. So Bitcoin has a special reputation around the world and it has already built an established position, it's common understanding that other cryptocurrencies are just Bitcoin's copies, so it's really hard for an Altcoin to get Bitcoin replaced. It's a matter of recognition and legitimacy, I guess. Therefore, as far as this problem is concerned, Bitcoin is out of competition with other altcoins, as the founder of this blockchain network