I suppose you're right about that, so I can't make the argument go through by saying "mathematics" vs "philosophy". Maybe what I should say instead is that as some dialectics advance/technologies develop, subfields of both such things sprout up and have a lot of low-hanging fruit to pick, and in these cases, the new work will be descended from but not too-essentially informed by the prior work.
Like mathematical logic (in the intersection of math and philosophy) didn't have that many true predecessors and was developed very far by maybe only 5-10 individuals cumulatively, or information theory was basically established by Claude Shannon and maybe two other guys, or various aspects of convex optimization or Fourier analysis were only developed in the 80s or so, it stands to reason that the AI-related applications of various aspects of philosophy are ripe to be developed now. (By contrast, we don't see, as much, people on LW trying to redo linear algebra from the ground up, nor more "mature" aspects of philosophy.)
(If anything, I think it's more feasible than ever before, also, for a bunch of relative amateurs to non-professionally make real intellectual contributions, like noticeably moreso than 100 or even 20 years ago. That's what increasing the baseline levels of education/wealth/exposure to information was intended to achieve, on some level, isn't it?)
