I've been using Reddit for years and still use it, but I'm aware that many subreddits - to be honest, I'm not aware when trying to explain what I experience, and if the stupid mod doesn't agree or if they're running their own agenda - censor content. For example, if you have high cholesterol and are prescribed a medicine like a statin, and you get side effects from it or aren't satisfied with the medication you've been prescribed, then if you go to mainstream subreddits, they probably get paid or are even owned by pharmaceutical companies. Comment there about what you really experience and tada, get ready to get kicked off lol.
The same thing happens to subreddits like /seo and /bigseo. They're targeting mainstream so-called SEO gurus, and everyone's trying to sell something. If you tell them something they don't agree with, they're going to kick you off. After owning more than 1000+ domains and 300+ active blogs, doing SEO, building backlinks, getting traffic - my main traffic and main income still come from Google SERPS, then other search engines, not social media or AEO/GEO. Most of my sites are suggested by AI overviews because they get citations from third-party websites we made. But I can see now that new users coming to the internet (Gen Z/Alpha) and these things are new to them. After they see mainstream sources, they start to believe. And here also, I can see that without doing anything, some claim this doesn't work and that doesn't work. For the last few years, I've been trying to dominate a few local brands related to health, and none of my Facebook/social media/PR efforts work. But I have all my success with SEO. And no, I don't sell services, backlinks, PR, or guest posts because I don't believe if someone can truly dominate, they don't offer any services - at least not the people I know. But if you go and see Reddit-like places, then you'll see everyone trying to sell a bunch.
That being said, to answer your question: no, I don't think search engines or that traffic are going to die any time soon - not for the next 10 years. It may evolve with new fancy work, but it's not going to die as long as citations still come with users. After all, the internet is about connecting with people, not bots.