Many reason pointed out in the article to believe in the future of Bitcoin :

https://www.cnbc.com/2018/05/26/bitcoin-still-a-buy-says-blockchain-venture-capitalist.html

Also a good statement about ethereum and its relation to ICOs:

"Bogart said he's especially cautious with ethereum, which he said has a lot of overhang because so many initial coin offerings (ICOs) have been built on top of ethereum. He pointed out that if the ICOs don't work out, that could be bad news for the platform its built on. "

It's all just opinions, so my is that it will hit 20k, and I am coming back to this post to say I was right lol.