At the end of the day it's still a prediction so we should not really fully trust this 'cause we'll never know until we reach 2020 and see how other coins will perform in the market. Well, I don't doubt the others like ethereum, litecoin, neo, and eos. Especially bitcoin, knowing that it'll be part of top 10 and will dominate among the rest for the next coming years.
If the prediction comes true or not, I will continue holding my Bitcoin & Ethereum then buy them at dips as much as I can because I strongly believe that these two strong coin will boom in the next coming years. It's early to say but nothing can stop them to revolutionize our financial system, I have say this because many have tried but failed to do so.