They said the same thing of physicist, biologists, geologists, chemists, etc. before, that is until they found themselves irrelevant. I suspect in time, it will happen again.

which they is this?

Philosophers, I think. But the field as a whole seems to treat relevance as an afterthought.

in part this is because whenever something relevant comes up, it gets a name that is not philosophy.

Also because we're still shaking off perception of philosophers as useless navel-gazing victorians; post WWI, the field has become substantially more akin to formal math and logic.

I second the vote for Husserl. Merleau-Ponty could help, too.