I don't believe this. I think a market cap in the hundreds of billions is realistic and can happen in 2018 if not sooner. I do not think we will see any crypto tech with a trillion dollar market cap by 2020 because that would require true mainstream Facebook scale adoption of crypto which isn't going to happen in mere 3 years. I do see the entire space reaching 1 trillion by 2020, I just don't see Ethereum having a trillion all to itself as if these other tokens aren't there.

Ethereum will do very well, will be in the hundreds of billions, will be in it's bubble at 100 billion+, but there will be others.