There are many cryptocurrencies out there, the fluctuation is wide and big. Theres a need of a coin that uses a process to stabilize its value.
No doubt that there is no other cryptocurrency or altcoin that can supersede the bitcoin. At least not for the next 5-10 years. Of course there are many rising competitors like Ethereum, ripple and litecoin.
Do you agree???
Maybe after a decade bitcoin will replace by some altcoins. Because bitcoin is the king of crypto, and bitcoin is a tough coin. Bitcoin will not be beaten so easily,

and yes, i know that many altcoins now are rising and compete to take down bitcoin but for now it is impossible.