Whistle-blower cases that go on forever are not uncommon (see Nature 503, 454–457; 2013). The cold conclusion is that the whistle-blower may survive, but the odds are against him or her.
I have worked with whistle-blowers for more than 35 years as an expert witness in court cases and as author of the forthcoming book Don't Kill the Messenger (see www.whistleblowing.us), and find that they are hard to silence. The truth-telling part of their brain seems to override the health and safety part, so they will endure all forms of retaliation for the sake of truth.
Institutions can also be very slow to admit to any mistakes on their watch. This factor delays adjudication and makes it harder for the whistle-blower to prove anything in court.
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Preventing Egregious Ethical Violations in Medical Practice: Evidence-Informed Recommendations from a Multidisciplinary Working Group
Journal of Medical Regulation (2018)