Based on the crypto market in April 2024, ETH likely remains firmly within the top 2 cryptocurrencies. ADA, XRP, and TRON could potentially still hold positions within the top 20 altcoins, though the altcoin market is highly competitive. It's natural for some projects to decline in value or even disappear, particularly those that lack real-world utility or offer nothing beyond 'pump and dump' schemes – often referred to as 'shitcoins'.
Top coins always remain on top because they possess strong fundamentals and also they have gained the curiosity of individuals till its origination due to which their demands remain higher. Although the altcoins are in dip currently due to market dump but top coins like Ethereum, BNB and many other coins are still in their top position.
In such circumstances where pump and dumps are regularly happening only successful coins can survive while all other scam projects will end with the end of bull season and high value. Only real coins can stay forever while shitcoins cannot stay longer and deteriorate in values day by day.