Feel free to share your guess, but please back it up.
Does surviving or not depend on the amount of demand?
Or does it depend on the quality of the tech behind the project? Those 2 don't necessarily go hand in hand.
It seems to me that BTC and Ethereum thank their growth prospects to their established names, rather than the tech behind it.
If you think it's different, let me know.
Will not talk about trending tokens and memes, I just give my opinion on top altcoins. If we talk about altcoins other than ETH and BNB, all the remaining altcoins are likely to not exist or will be replaced by newer altcoins. Alts are often replaced during each bear season because they cannot compete with new projects, as older technology will cause demand to drop and will be replaced by new projects.
This usually happens with older altcoins from 2018 and earlier as they don't have too many features, but nowadays layer1 and layer2 projects are all extensible so they are easy to upgrade to any technology which is new. So it's very hard to be replaced or die unless the developers don't want to develop the project anymore.