The Altcoins prices are correlated to BTC price. The prediction of Reddit co-founder is a bit irrealistic. especially when you consider the global cryptocurrencies marketcap. That prediction should be for 2020.
But for some cases, altcoin can be better than bitcoin because as we know, altcoin demand getting greater from time to time.
Let's compare ETH value for example with BTC when it has same ratio with ETH.
I can see uptrend for ETH in this year !