Many meme coins emerged after the Doge coin boom at that time, even now we would have difficulty counting how many meme coins there are today.
The developers see the potential of meme coins , they are easier to promote meme coins after Elon Musk supported Dogecoin as one of meme coins. The developers also don't need big efforts and no huge capitals because meme coins are mostly the coins with no fundamentals. So, the developers don't need to be confused to build the fundamentals firstly. They only need to have armies to spread the hype of meme coins.
Many people have been looking for Doge coin for a long time because of its cheap price and very cheap transaction fees via Doge coin.
Yes, Dogecoin has cheap price, people think it has the potential to be $1 in the future. However, it makes sense if the price is cheap because it has unlimited supply. I guess the price of Dogecoin will be always cheap forever because of the number of the supply. Sure, the cheap transaction fees is one of good thing about Dogecoin.

I am also sure that Doge will remain the king of meme coins, even though there are currently many new meme coins.
Not sure this will be always the king of meme coins. If Elon Musk no longer supports Dogecoin, maybe other meme coin will be the king. Now, Shiba Inu and Pepe look to have faster improvement in their prices. I don't know why Dogecoin price looks to be harder to increase significantly nowadays.