It's hard to predict the future, but Ethereum is definitely going in the right direction, with the implementation of PoS. If they can transition to full PoS and add other features such as sharding, they can solve a lot of the problems of the crypto world in general and without a doubt, they can become the currency of the future. Projects like EOS also show a lot of promise but it's too early as well to make predictions about them. The only thing we can do right now is to grab the popcorn and enjoy the crypto ride.