No. Nothing will cover all kids, if the goal is to make sure that 100% will play with their grade. Kids start school early, and are allowed to start late, all the time. When it comes to club soccer, many of them are also enrolled in private school, where in that case these school cutoff dates don't matter much. Moving it to July 1 instead of Aug 1 may in fact be beneficial in that less kids would be affected - if that is closer to the cut-off date for most school starts. But any date chosen is going to advantage some and disadvantage others. If they choose Aug 1, those with aug birthdays have the most options, while those with July birthdays are hosed. If they choose July 1, those with July birthdays have the most options, while those with June birthdays are hosed. And if they stay with Jan 1, those with Jan birthdays have the most options, while those with December birthdays remain hosed.