Xhorndog, the groups you are referencing can always get Finasteride in generic form via Indian manufacturers etc.
I think what this woman wants to do is have Merck’s brand name Propecia removed from the market for hair loss treatment (controversial risk/benefit ratio for a cosmetic condition), not for the other intended purposes you mentioned (transgender therapy, androgen deprivation for prostate cancer, BPH treatment).
Even if Propecia were removed from market, Finasteride will still be avail to those who want to take it in generic form… therefore, your concerns are a moot point.