I doubt that bitcoin will be replaced by some other coin. Useless coins will certainly disappear not to litter the market, and the top coins will start to develop soon.
Bitcoin will not be replaced, potential Altcoin cannot replace the position of Bitcoin, especially coins that have no value. but there is still the possibility that a coin that has no value can rise so you get a profit, but it is not easy and requires patience. Crypto currencies will increase higher and maybe only potential coins and Crypto coins that will return to better and more popular expectations.