i dont know about preidicion about cryptocurrencies int he future like in 2017 or not, we can see that in 2017 the cryptoccurrencies is booming, every people in cryptocurrencies is try the ICO project and airdrop, and we can see that the coin in 2017, right now has a big value, so i dont know about 2018 but from first 5 month in 2018 i believe that cryptocurrencies will more success than 2017
It is not so easy to predict about the future of bitcoin, in fact we only work on our speculation, in fact we take a decision from the current situation, in current time as the bitcoin users are increasing too much which is in fact making bitcoin more popular and trusted, so we can predict that bitcoin has a very good and bright future, bitcoin will remain as number one currency for a long long time, because no other currency can compete with bitcoin.