In the current state of bitcoin this is the king of all coin. But as the competition for the coins increase the time may come that bitcoin will be replace by other coin. As other coins arise the users of bitcoin are splitting and we should admit to ourselves that we are also reading thoughts about the other coins and our loyalty were been challenge because maybe they are doing much better. But based on what I read still bitcoin is in the top of among the coins. We should hope that the competition must be healthy and may the best coin wins.
In the first place no one can replace of bitcoin in the king of cyptocurrency because bitcoin is the first coin in virtual currency and the value of bitcoin is continue to grow up so that its very hard to beat the bitcoin on other coins but we dont know in the coming years maybe ethereum will beat the bitcoin but not now i think theres many years to come to beat bitcoin.