Altcoins are just distractions from Bitcoin. They usually have no real value except as a mining pump and dump profit. What was the last time anyone had a serious thought about Dogecoins being a world-wide accepted currency?
Well there was that one time they sponsored a nascar driver, but I have a feeling they never really expected it to go anywhere.
I think the "doge" memes died pretty quickly, and dogecoin died along with it.
Doge is still alive. It's great for microtransactions, because the fee is so small (1 doge which is about 55 satoshi). If the whole micropayment model took off (where you pay for viewing videos or reading an article with a coin, doge would take off, because it's ideally suited to it. At the moment micropayments have yet to catch on though because people are still addicted to getting stuff for free or getting stuff paid for by advertising.