Is because the name "Bitcoin" is the best name for a crypto-currency.
No other name will be as good.
I don't think so , if the name is the base there are some good names on cryptocurrency ,Like Zcash ,Doge coin, Cashout .
I think the formost reason why bitcoin remains number 1 because it is the original or the same as the first Digital currency that exist then next is the other cryptocurrency.
True, the reason bitcoin will always be #1 because it is the main crypto. Johnny Dilley even once commented in an interview that most altcoin is fraudulence, and he also thought that the Bitcoin developer could not threatened by this altcoin. Moreover altcoin is part from bitcoin system that was developed, so I think it is impossible if altcoin could be better than bitcoin. So I believe bitcoin will always be #1.
I think there is a sense on what he is saying. Bitcoin as a name made it popular in the cryptoworld. For instance when I share about Bitcoin some of my friends think of it as some kind of web money which is correct, however if I mention Ethereum they think of it as some kind of mineral in the periodic table. Bitcoin is the pioneer when it comes to the crypto world.
You right every person who knows crypto or digital currency is certainly the most they know is bitcoin. I think it's natural because crypto created and developed first is bitcoin. So maybe I do not think it's because of the name, but because of the existence of bitcoin as the main crypto, it is the reason bitcoin always be #1. Perhaps you are right there is a sense of what he is saying, maybe he can explained in more detail.
The thing is, Altcoins exist because of bitcoin. The idea of making Altcoins is to be the rival of bitcoin, since bitcoin is the one who got the spotlight first. Bitcoin is not that popular way back on its first year in the world of cryptocurrency, but days passed by, until now, bitcoin is the most popular coins amongst all the coins here in the cryptocurrency world, why? because of its solidity, valuability, and its advantages.
Though unlike the other coins here in the internet, that will just vanished in thin air because no one is using it, bitcoin stands on its feet all along its existence, and its awesome because of its greatness, and I wish that bitcoins success will be continuous for us all.