First, we have to remember that there are many things we still do not know regarding neuroscience. There are a number of theories we have that, while good hypothetically, have not been proven - sometimes because ethically we can't prove them due to the consequences of so doing (killing or impairing the patient and such).
Second, although a protein linked with CTE may have been found as described this protein has not been proven to be the cause of or to be exclusively related to CTE - meaning it could be there due to some other cause.
Thirdly, in order to show that these findings have any relevance you have to compare similarly situated non-football players and/or non-athletes to football players, accounting for other circumstances such as other causes of head trauma like MVA's.
Bottom line is this research at this point doesn't change a thing really from a scientific point of view other than advancing the science a little further. Still, years of research need to be done to bear out the multiple assumptions made by the author.
That being said, there will be changes to the game. I enjoy the hell out of a good clean hit, but I don't watch boxing because I don't enjoy seeing people brutalize and potentially permanently injure someone. Yes, injuries are a fact of life and they will occur. No, I don't want to watch someone prepare to be the next Ali or Turner or Seau or whomever.
There are already changes being made for the better with the best evidence we have regarding head injuries and we must remain open to new science. We must also change with the science available to us. It can be very frustrating when I have to defend my decision to remove a kid from practice/game time to give their brain a chance to heal from a parent who doesn't get it or doesn't care. We are getting better in this regard and some of the recent changes are needed, though not perfectly implemented. There will be more changes and not only will they save the game we love, they will make it better because it will be safer. Not all head collisions can be avoided, but they should be reduced as should the severity of them when possible. The game will not suffer as a result any more than it suffered from the penalization of spearing.