What if a cure for hair loss was found?

Let’s say one has been going strong on Finasteride for a couple years now and he experienced a great amount of regrowth. Let’s also say that a new treatment for MPB has been found, proven to be better than Finasteride. Would it not be recommended to stop using Finasteride for the new treatment since they will be losing the hair they regained?

As there is no such treatment available, it would be impossible for me to say what would happen under such circumstances.  That would, of course, depend upon the treatment itself.  The question that needs to be asked and answered is this: Does the “yet to be discovered” new treatment address the miniaturized hairs as Finasteride does or does it just grow new hairs from the quiescent hair cells that we know are there but inactive?