I'm gonna be brutally honest. There is absolutely no way in hell you were born with that hairline. I would say you're hair loss is aggressive for your age. Without finasteride and minoxidil you could end up a Norwood 6 by 30. 1mg of fin 3x a day will still be effective enough to slow your hair loss. Because the half life is long, you don't have to use it every day to get results. You could also use topical dutasteride which is said to be just as or even more effective. If you respond well to medication. You may not need another hair transplant for a very long time. Now, you should definitely bank on having at least one or two more hair transplants through out your life even with meds.
Now, i'm not sure if your expectations match the reality. You're a young aggressively balding guy. A dense Norwood 2 may not be possible. It all depends on how well you respond to medicine. I suggest getting on medicine for at least a year before deciding. In the end, doing nothing is never a bad choice.