Look for new blockchains like NKN, Pchain, Seele, QuarkChain - they can be Etherium's killers and make x100 in near future, DYOR!
I think those who altcoins who claimed as eth's killer are already complete failure because they are just concepts that still needs proof. I would suggest Vechain, Wanchain and Utrust for a real x100 in few years.
After the discovery of btc there are some altcoin like Eth, Monero which is the best altcoin among them based on smart facilities and idea in the market so eth has good future also profitable et investment.