In five years I think ethereum will reach the price of Bitcoin today or even higher. So investing now will be the wise idea to do. It will be the queen of cryptocurrencies as Bitcoin is the king.
Yup, ETH had the potential to do that.. I believe ETH will be huge in the next 5 years..
But don't forget about BTC and other coins as well.. I think it is good to spread our investment, not only at ETH alone ~