It is the incumbent in its particular crypto niche and will probably be difficult to dislodge. If EOS can be all it aims to be then ETH might be in for a battle, but EOS has a terribly lengthy path towards fruition of its goals. I threw a very small amount of money into EOS because I think it has a slim chance of being an ETH killer. With all the support that ETH has I think that it's probably going to be here for the long-term. I forecast $1000 ETH by the end of this year.