I fear that Kagi is going to suffer the same fate as Neeva did:
"In a way, the brief flicker of Neeva’s existence tells everything you need to know about the last 20 years of search-engine supremacy. Building a search engine is hard. Building one better than Google is even harder. But if you want to beat Google, a better search engine is only the very beginning. And it only gets harder from there." [1]
Not to mention Kagi's continued sustainability issues (28,071 users at the time of writing) [2] and their plans for their own AI products [3] [4] that would inevitably and eventually doom them.
Also, ADeerAppeared is right that government intervention aka a major breakup needs to happen for competition to thrive and I don't see it happening (although I hope I'm wrong).