All the likes of Zelda, Mario, Halo, Pokemon, etc. are going to get forgotten

I disagree. The reason being that video games and gaming of this caliber are completely unheard of in all of human history. We've come further in gaming tech over the last couple decades than the grand majority of all humans that have ever existed could even dream.

That being said, as long as emulation exists, there will be fans of big ips. The problem with saying "it'll get forgotten as soon as the last person stops playing" is that the specific circumstance of modern gaming is unprecedented. People are still out there emulating games that came out in the 80's. There's really no rule saying this kind of technology won't last hundreds or thousands of years like more classical games do.