Right, I also agree with you, the two coins you mentioned coin doge and coin shiba are the best meme coins if other meme coins won't necessarily survive and I see a lot of meme coins which are just trash coins and it's very natural for trash coins to be removed.
Doge and Shiba have proven themselves to be the best meme coins among the hundreds of meme coins that die out every year and it's only natural that both coins are still gaining huge volume and fans are still in the market.