That’s not really what Jeremy said, though. The feedback they got (and have consistently been getting since the initial dndnext playtests) is that the majority of players want to be able to play cool and interesting concepts without having to navigate a bunch of different subsystems, but that a passionate minority really enjoys such subsystems. Accordingly, they try to provide a simple, easy to use baseline with more complex options for the group that enjoys them. They probably won’t discard the psionic die completely because the folks who liked it, while a minority, really liked it. It just won’t be tied to all psionic options moving forward. I would bet we end up seeing one Psionic subclass that uses that mechanic, while others cleave a bit more closely to the baseline 5e mechanics with few bells and whistles.