It was a temporal casualty. It was forced out of production (1950's) at a time when Antibiotics were supposed to herald the "end of disease". There was no knowledge then as to how it could possibly work for so many different conditions and testimonials are not medical research.
Wondro produced amazing results, but why?
Truss's work was brilliant, but where was the proof?
Both of these challenged the paradigm of their time to such an extent that they were labelled medical heresy and dismissed as frauds. But now these two ideas (venom/antidote) mesh together so well at the molecular level that they may provide insight into a host of downstream disease states that have baffled even the most sophisticated analysis available to modern medicine.