If humans have free will, they have always had free will. If humans do not have free will, they never had free will. So where this takes us is exactly where we were always going to go anyway. The only thing we stand to reveal is which direction that is. Are we going along a path where we are making all the decisions or are we going along the path where decision are being made for us, determined by programmed instruction in our genetic code.
One thing is certain ... No matter which path it is, we won't be able to tell the difference. Humans for a long time believed everything was determined by fate. Then in the last 2500 years of so, they started believing they had free will. The shift from fate to free will didn't produce much of a change for us. It didn't even change our society and the way it functions much. For for the most part, humans still behave in the same way they have for the last 10,000 years. So unless something really radical happens that changes our entire world like the end of the ice age did for our primitive ancestors 10,000 years ago, don't expect the human race to change much just because we may or may not really have free will. It's highly improbable because subconscious behavior always overrides conscious thought. And we just do what we do because we do it.