Headers will be gone from the game in out lifetime imho it'll start with the kids at grassroots and then filter up, pretty sure I read heading is banned in the USA till ages 10
We ( my girls team ) play teams and occasionally the other coach will ask before the game " are we doing headers " as some won't, which then give the other team a advantage, Before christmas we had a game where the other team wouldn't, we would put corners in the air ( I must admit, the girls worked this out themselves ) and we scored 2 goals from headers corners ( which we had practiced corners In training over a set training period ) which ( from a coaches point to view ) was great to see see things worked on the training field actually being put to use,