Good question! Looking at todays marketcap of EOS; it's hovering around 250MiL, if we times this by 70 and you'll get 17.5 Billion MarketCap. This isn't even the MarketCap Ethereum has today!! Yes more tokens will enter the market but also the need for solid good Blockchain protocols are growing enormously. Look at the total Crytpo's market cap, from 5 Billion to 180 Billion within one year. So I honestly think x70 is very realistic.
Hope that explains your questions.
RE: EOS a.k.a. Ethereum Killer is the token that's dropping like a rock, but it can give you easily 70X gain within one year!