I suspect that all the people who made careers off of psychologizing us will be allowed to go back into the woodwork without apology or accountability. Or they’ll start new trajectories pushing CBT as a cost effective therapy for even “biological” illnesses.
There will be more fighting to be done, but at least we’ll have more people on our side who simply weren’t paying attention before there was a biological story.
It's likely that not everyone who currently has an 'ME/CFS' diagnosis will actually have whatever problem the new biological explanation points to. Some will be left as a 'mysterious chronic fatigue' afterthought and they'll be great prey for the psychologisers - not only are all their tests normal but they don't even have what they thought they had!