The thing about "meme" coins is that anyone without coding knowledge can launch their own coin and scam investors for profit. A "launchpad" such as Pump.fun is a good example of this. So unless your "meme" coin has a strong community or fanbase, it won't be going anywhere soon. SHIBA and PEPE still has their fans, so they will remain alive for quite some time. But due to the lack of real use cases, prices will probably stay below $0.01 forever.
At least, SHIBA has its own L2 network called "Shibarium". Attractive BONK and LEASH rewards by "staking" SHIBA might increase demand over the long term. 2030 is only 5 years away. A lot can happen by then. I'm sure Dogecoin will outlive most of the "meme" coins due to being the oldest one in existence. Crypto land behaves in many strange and bizarre ways, so expect the unexpected.
As for having account since 2014, i am sure you are aware of this, but in case someone else is reading this:
It was way before tokens were a thing, when it was rather easy to launch a memecoin. We just didn't call them as meme coins. There were just coins with some specific themed names, like cities and animals, persons or anything really. And if one of them was a success, other similar themed coins were launched instantly.
All you needed was to copy the code and write announcement for it. Just having one coder that wasn't talented any way, and a decent graphic artist was a sure way for the gains.
None of them were secure as there were so few miners, so even though all of them had seperate blockchains, they were less secure then generic tokens these days.