Different people have differing opinions about what the price of Bitcoin could be by the end of 2018. Its always good to stay in the optimistic side, however. Bitcoin could be at $40,000 at the end of 2018. Ethereum, which I think just touched $500 or is getting close, could be triple where it is as well. However, it can also plummet down significantly as well, continuing the downward trend it currently has. This depends on the market and what the market believes to be true. Various influencers are predicting crazy price levels for bitcoin in 2018, but anything can happen in crypto world. Bitcoin was $1,000 in January 2017 but it went high up to $20,000 in December 2017. The key factor to look out for is the news surrounding a coin. You can tell a lot about how people will react after reading that news and use it to make calls on what you think the price will be soon after.