Excuse me and pardon my ignorance... but isnt a degree like a PhD an award given out in recognition for effort put in research? If yes, how can the recognition of the effort have a shelf life? Even if the research after a decade becomes obselete, does that take away the effort put in in the first place?
There has to be some differnce between an intellectually stimulated effort and technology/science fast becoming obselete due to R&D.