Great questions. No, unfortunately, finasteride doesn't regrow hair, as others have said. Finasteride is a 5-alpha reductase inhibitor that blocks the conversion of testosterone to the more potent androgen DHT. Hence, those hair follicles with DHT receptors will be less likely to regress as there's less circulating DHT.
I think the most likely scenario is surgically implanting cloned hair. I would say the technology for this is about 20 years away.