There is always some sport in season; but with the start of school, sports can get out of control. I play in our hand bell choir and even though there are only about 12 of us, it's hard to find a time when we can all be at rehearsal. Somebody always has to be out because of soccer or some other travelling sport. And I can't point a finger, because our family faced the same thing when our daughter was in color guard for the band. With getting home in the wee morning hours from late night competitions, it was difficult for her to get up for church on Sundays. She did it, but when the competitions were far away and required Sunday travel time, there was no way for her to be at church on Sunday. My husband and I weren't happy about it, but we let her go.
I suppose you could say that unless parents refuse to let their children participate on Sundays, things will continue as they are. And you're probably right, but try saying that to a kid. It's especially difficult when your PK has to go to church when so many don't anyway and when other people notice when your child is not there (and make a point of saying that they notice).
Right or wrong, my spouse and I decided to let our daughter just be a kid. What we found is that she gravitated toward other Christian kids and hung out with them. They became her core group, and I'm sure they looked out for one another and lived out their faith even in some difficult situations.
Do sports do interfere with church or do they also provide increased opportunities for Christian witness? What's it like where you are?