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???
I don't really agree because Ethereum and Ripple are not competitors to bitcoin. Ethereum goes for dapps and for "blockhain startups", and ripple is not really a coin, and is just a token used to maintain a network working and has no real value. LTC is just to bitcoin friendly in order to become his competitor, so right now bitcoin has no challengers in my opinion.