You sure about that? Google Search is backed by a pretty big-serious ML model, and it's gotten a lot worse in just the last few years.
These were developed without the big bucks, so the tech has improved for smaller players at least.
But yes, in general, models won't get worse than they are now (or if they do, they won't stay that way.) At Google, search has been enshittified for business reasons, not technical ones.