It already does. Only this year ETH had a return of over two thousand percent by which any count is one of the best pefroming cryptocurencies this year. Considering that it's the second most capitalized coin out there, it's fair to assume that trust in ETH is very high (money talks) and that's a good indicator for future growth as well. Fact is that more and more developers are using the ERC20 standard which has been developed by Ethereum and more and more ICO's are using Ethereum as the underlying network on which they operate. All these are important growth indicators. ETH has already made descent returns when compared to BTC (BTC will probably always hold the top spot though) and it's definitely an important asset to have to any portfolio.