It's only going to be even more extreme. There were 44 coins then and only really 3 of them have gone on to be a success. There's really not much need for more than 50 cryptocurrencies and that's being very generous. Many of the current top 20 are competing with one another and eventually one of them will win out and the others will become near obsolete, they can only all succeed right now because the market isn't established and there's still plenty of money to go around. Expecting that NEO, ADA, IOTA will be 3 to disappear with time, ETH will probably stick around just because it's so big now but better alternatives will come to steal its marketcap away.