Yes, there are lawyers who have become experts on these cases and whose tireless work have helped hundreds of people. But that doesn't scale, there are tens of thousands of cases. The real solution will come when doctors fully update their knowledge, which may still take a decade or two.
Is is possible they don't want to update on that? It seems this is all some sadistic plot to make people guilty of invented crimes, I can't see what else it could be at this scale.
Nah, it's just the inertia of a bad idea: and a bad idea with big consequences is one of those things which is really hard for people to change their minds on. Just think, if a doctor who has testified in many of these cases were to understand that they were wrong, it would mean they would know they had contributed to the imprisoning of many innocents. It's not at all an easy task emotionally to come to terms with that, so denial is a very common outcome.
We've had one in French for a while, and we've been wanting to create an English version for years. It's about time we get started on it. Otherwise, there's already https://shakenbaby.science/, which serves as a landing page for a recent book.