Concussion safety in contact sports is an ongoing issue that is the cause for much debate, especially in football. New helmets are continually being developed, but they come with a hefty price tag. You could write about how this affects youth football safety. How are limited budget youth football leagues able to afford such helmets, what are they doing about it and how is it affecting children's safety?
The NCAA is an extremely profitable organization, yet its student athletes are relegated to amateur status, just like most Olympians, and they are very strict about it. Should they be allowed to see any of the proceeds? Granted, they probably shouldn't get professional athlete money, but there is an ongoing debate as to whether or not they should get at least a stipend to help with their expenses. This way, they would be less tempted to go pro, which could in turn help sagging graduation rates.
Ticket prices and salaries in professional sports have ballooned exponentially over the years, and it has alienated many fans. Of course, it hasn't yet reached the point where popularity has suffered, as attendance remains respectable for all major professional leagues. Focus your paper on how much is too much, and how it might eventually force fans to stay at home .
Explore the effects of parents who push their children into sports. For example, many fathers make their sons --- who only have a passing interest in footbal l--- practice for hours on end in hope that one day their boys will become NFL stars. What are the negatives of this in regards to how it affects the child, and how much can it bleed over into other areas of his life? Focus on the resentment aspect.