I heard that, too. But looking at the popularity of altcoyins, I would not say so. I think they will still live. Even more will say they remain in demand and have not a bad development. Which makes a lot of profit.
of course not all altcoins will live and there will definitely be those who fail because of lack of interest and not sell well in the market. that will sell well and do not have a bad development that is altcoin that can make someone interested in investing in the altcoin and become the most popular altcoin on the market. the advantage of investing in altcoin depends on our own how we get it.