There is no economist who could predict the value of something in next hours, days, months.. But if you look closely at bitcoin chart you can notice that the price has always been rising (for the amount of few x) and dropping (as much as 80%), but generally it was always going up. And because many people on the world still didn't realize the advantages of crypto currencies, and I suppose they will in the future, I expect it to rise again and we will see the new high in 2018. For BTC and ETH, maybe not for XRP tho..