The reason for that level of sucess is because it does better what it proposes to do, which is to be a good store of value and censorship resistant. Most other currencies try to do the same, but there is no way for them to achieve this being so centralized.
Nope it does not, Some Altcoins right now have defeated or has surpassed on what technology Bitcoin is already offering the only problem is even if they are a better cryptocurrency than Bitcoin majority of the people participating in the market are holders of Bitcoin because it is the pioneer in the crypto market giving it an edge in terms of popularity.