Never say never especially with altcoins. Amd in terms of shiba inu coin it can easily fade away. Doge has first mover advantage in terms of memecoins so I think doge will be fine. In my opinion next bear run shib will probably fade away. Every cycle new coins come in the the older ones go away. Just the way it is.
honestly I think meme despite the narrative as just a shitcoin, won't fade away that easily, it's quite different with other alts that are utilities based because if there comes better alt with better utility it will easily replace the older coin but with meme, it's a trend, and a hype, basically people don't really care about the utility, the meme can just exists and there will be people buying it.
most of meme just got that massive support coming from the community and thats it, even if there come bearish season, coin like shib will tanks, but won't fade, probably starts picking up later on once season changed again.
so I don't really agree that it will just go away.