many Altcoins have died or been abandoned because they cannot keep up with the times, the digital world continues to develop and change all the time, therefore most of the new Altcoins are even more desirable and considered more interesting, but there are still quite a lot of old altcoins that can continue to survive because they have successfully adapted with the times, for example ETH, XRP, ADA, Pol, and many more
Of course the development of this blockchain technology will continue to be a concern. New ideas are constantly being implemented. One of the blockchains that survives well without any changes is Bitcoin. Cardano was previously forgotten, but over time they also developed a smart contract system on the Cardano blockchain. Now there are tens or even hundreds of tokens that have been developed based on the Cardano smart contract. Of course if the developers are silent, and let technological developments run in place, of course they will be forgotten. It seems that Dogecoin doesn't care about all that, it's just that there are parties who want to develop the Dogecoin blockchain in another version.