Altcoins may have come up with some very sweet idea, but you will only start finding those loop holes eventually when you start using them the way bitcoin has been used. It can also give competition to fiat currency in the coming future.Bitcoin has a lot of users.Ethereum which is the second cryptocurrency also does not have that much of potential to defeat bitcoin.
If one will outdate bitcoin, this can be only ethereum with the current conditions. No other one has the same level of trust in the eyes of community. Creating a faster (transfer) currency than bitcoin doesn't mean it will outdate bitcoin.