The low-level FAA person that illegally granted the waiver should be investigated, as should the JetBlue executives that should have, or DID know, that he did not have the authority to grant such a waiver.
The JetBlue pilots that participated in "test piloting" the study have something personally to gain from it. They want to be able to fly back-to-back transcons and put more flight hours in a shorter period of time. Work two days a week (10 hour transcon RT x 8 times a month). They obviously don't give a rats-butt about what such rule changes could be used and abused by unscrupulous airline managements to further push pilots.