bgx, when we talk of a "hair loss cure" on these forums, what is implied is that it is a cure for Androgenetic Alopecia, which accounts for almost all hair loss in men. Hair loss that is permanent in nature and that is caused by something other than Androgenetic Alopecia is extremely rare.
A total cure for Androgenetic Alopecia is a long way off, and will likely never appear in our lifetime. Better treatments will probably come along to replace 5-ar inhibitors though, but this may not be for at least another 10 years or longer. Most of the experimental treatments that are in the pipeline will likely turn out either not to work, or to be far less effective than what the researchers initially claimed. Setipiprant, for instance, has been used by members of these forums for several months now to test its effectiveness themselves, but it is becoming clear to us now that it isn't that much of a miracle treatment after all. That Italian lotion that everyone is getting excited over in another thread will probably turn out to either be totally useless, or to give only very minimal results.
Maybe, just maybe, some spectacular treatment will pop up out of nowhere sometime within the next 15 years that will be far superior to finasteride in terms of both safety and results. I personally doubt it, and I won't be holding my breath, but maybe that wonderful treatment we've all been waiting for will come along.
