Even though Shiba Inu was one of pioneer of the terms of "meme coins" and people have lot of faith in this project. But no matter what they have been done, at the end it's just a meme coin where the sole reason this project even was at the top just because of the hype and influence from other big people. And for now, with so many meme coins out there, the big people there would probably only hype those new one.
If you have to consider one of pioneer in meme coin which is Doge then Shiba inu, and if a meme coin will competitor for Doge in the future also which is Shiba inu, peoples trust those coins although these are meme coins, but in my thinking these project will long live, these will not dead in shortly, Doge will never because it's proved that it's a good coin for long time leading in the market with a lot of big coins.
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.