With the emergence of a new altcoin on the crypto market it will certainly become a fierce competition, more and more new altcoins can affect the old altcoin, it is not so easy that all the old altcoins will be defeated like ethereum will continue to shine, the old altcoins that are defeated are only limited to altcoins that are not there is confidence in the vision of the future and will die by itself
Many alt coins are death and many of then running to death. How can it possible more than 650 projects not added even one single code.
Market conditions changed so much. Knowledge level of investors are traders changed so much. Alt coins with no team will go on running to their death. Scam project will be defeated at the beginning.
Strong projects as you mentioned like ETH will go on its road. Binance Coin, Link, Atom etc. kind of projects will lead the alt market. Specially BNB is the favor for taking place of ETH.