Look for new blockchains like NKN, Pchain, Seele, QuarkChain - they can be Etherium's killers and make x100 in near future, DYOR!
Bitcoin is indeed the king of coins but for Altcoin, it also plays an important role in advancing Cryptocurrency market and making it increasing and reliable. this is the potential of Altcoin as a coin that very able to be relied upon and become a coin of pride. so Altcoins like Ripple, Ethereum, and EOS are potential coins to support Cryptocurrency market progress.
with Altcoin's current development giving it a high potential for Altcoin to have a much better future. besides, it is for Altcoin which has a growing development can make Altcoin potentially, and become a mainstay in the future. and I'm sure that Altcoin is worth the future and is able to compete with the powerful Bitcoin.