1.CRYPTOCURRENCY IS BECOMING TRENDY.

The idea of blockchain technology is finally cool for too long cryptocurrency has been associated with geeks and nerds.Ans cryptocurrencies become accepted in more places like artisan food shops,coffee shops ,hipster clothing shops and the likes and as more in technology apps,exchanges,wallet and more.it becomes far easier for us to add a use value to cryptocurrencies coins are like bitcoin cash and litecoin are really leading the way here.

2.INSTITUTIONAL INVESTMENT.
Yep,we are back with this old chestnut. The thing is when cryptocurrencies generate more value,they became categorically more popular. And big institutional investment is excepted to take the market by storm at the end of the year investment from the top 1% will see prices driven upwards. Not only is high market value a consequence of this and increase in main streem popularity is too.

3.CENTRAL BANK INTEREST.
More and more central banks are exploring the use of cryptocurrencies wishing to use them to understand how cryptocurrencies and blockchain technology can influence their countries. i belive that within these investigational many central bank will develop a more positive approach to cryptocurrencies which in turn will encourage smaller local banks to start to investigate crypto.

If you take it correct growth and the fact that there's a very limited amount .
I believe btc has a good chance to hit it's all time high price and more then 20,000$ by 2019.

If you like to see this esstimate i'll add it in the comments if i get 10 up votes.