I think that Ethereum is NEO and EOS worthy competitors. Because these coins have taken a good and fast course to raise. Adequate competition is always good. This creates stable and strong coins in the market.
Yes, if it's a competition that affects something. In fact, each coin is original and does not interfere with the specifics of the other. That is, Ethereum does not affect bitcoin in any way, and the other altcoins do not affect Ethereum in any way.