I can say this with pretty strong confidence: had the FDA not being so strict about its trials, lots of these experimental type of antibodies would have already received massived research and commercialization. But it is simply so much harder and so much more expensive to push something so different through the pipeline. A million things can go wrong, and even the biggest biopharmas can't handle that level of risk. Drug development, especially biologics, is so expensive it becomes incredibly conservative and resistant to changes.
Five guys in a garage can make a tech company that shakes the world. But 10 guys in a lab worth one million dollars trying to make a biologic drug will likely declare bankruptcy by the end of the year, at best. I would say by the end of the month is more likely.