[orbifold]

It's because the problems mentioned in the article are primarily philosophical in nature and not things most physicists, even quantum physicists, spend actual time researching. For example anything related to the many world interpretation or more generally the measurement problem, would make for a terrible thesis topic, it also probably wouldn't get any funding (Pilot wave theory in particular is explicitly excluded from receiving funding from the NSF, see http://www.mth.kcl.ac.uk/~streater/lostcauses.html). So the only people working on such things are professors well into their tenure and even they will more likely write about such topics during the family summer vacation.

[jostylr]

My thesis advisor does get NSF funding and he does Bohmian mechanics. I have a very talented colleague doing this as well and he ended up with tenure recently. But it is a very hard road.

I did a thesis on it which I am quite proud of. But I also left academia proper though more due to my disgust with various aspects of the system unrelated to the discrimination associated with Bohmian mechanics.

To be fair to your point, the successful ones pursuing this either hide out in mathematics departments or keep their mouth shut until well-established.