Ethereum has changed the world. And it will do this again in future. I suppose that it's the strongest coin. But it's already has reached the price limit for now, but after upcoming fork the price should go up to 1000$ or even more. This is my opinion.
the world change everyday. At the begining of this year we see bitcoin hold 90% marketcap. Now bitcoin hold under 50%. Maybe we will see some big change on 2018