Another variable here is that there is a very, very minimal amount of proof that one can offer regarding old cases, perhaps with witnesses not even being alive to provide testimony. There are inaccurate memories, and all the “metoos” cannot make fabrication become strong evidence. That’s a sort of natural “statute of limitations” that is built in to the passage of time.
Another consideration is that there is a strong argument to make for those institutions that have a policy that protects perpetrators, which could be a target of liability. I doubt most yeshivos have any such policy. In the absence of that, there could be a potential for personal liability for the faculty or staff involved, and there is limited projected gain. How many of these are still alive, and how many of the yeshivos are still under the control of these alleged protectors.
While I am all in favor of “let the guilty pay”, I agree with several of the commenters here that minimize the risk.