I'd be interested in a modeling study looking at the equilibrium infection rate, assuming everyone was on the drug, but otherwise did not change their behavior with regards to risky sex (or maybe even under a few scenarios of increased risky behavior from risk compensation [0]. You don't actually need 100% protection for the longterm equilibrium to be eradication of HIV (that's the whole idea of herd immunity).

How long would it take for a drug with this level of protection to result in ~no cases of HIV? What level of adoption would it require?

[0] https://en.wikipedia.org/wiki/Risk_compensation