In short I agree with you, with some caveats. While I agree the AIM9X is a serious threat, there are ways to beat it. It comes down to missle PK…
What we know about missiles is that their motors a have a finite burn time, usually a few seconds. With proper merge tactics you could defeat these missiles kinetically. Furthermore, shooting a missile very high off boresight depletes the missile’s energy quickly.
More details in this post.
That’s highly theoretical though, and the 9X has yet to be proven in combat. That said, I have doubts a modern fighter pilot would let it go that far. More likely, they would just exit the combat arena before engaging WVR. There are simply so many long range tools to leverage that risking the jet and their lives becomes trivial.