Dogecoin could fail in the near future due to its outdated blockchain technology. The Dogecoin blockchain is built on the Litecoin blockchain, which is based on Bitcoin's Blockchain.
One of the main issues with old blockchains is that they're not scalable. They are unable to manage large volumes of transactions without slowing down or mistakes.
How hard to update the technology behind the blockchain? Just active devs team is more than enough to do so. When dogecoin was pumped from 30 satoshi to 1000 satoshi, dogecoin's official core wallet was not syncing at all; still we experienced multi-fold growth (now dogecoin got a fully functional wallet as per I checked last). So, if you are complaining about their blockchain technology then I guess it would be matter of one or two weeks or months time to get into a new technology.
I wish, new active devs to cap the total circulating supply as I remember initially dogecoin got limited supply like 100 billions (please correct me if I am wrong) but after that devs changed it to unlimited supply.