Hopefully we may see 5 trillion by 2020 crypto currency market cap once bitcoin hit 1 Trillion we can expect the prices to be 50 thousand dollars as per current market capitalisation
I think a slow rise that reaches my peak in 2018 means a more stable and solid foundation of investors and supporters. Crypto market can reach one trillion dollars if all coins will increase in value.
I can not ask for more than $ 30000 this year's peak price. I think $ 50000 would be too much and with a spike and a quick rise of bitcoin also has consequences, a big downfall.