Personally, if I lived in Kidlington and wanted to go that direction at some point on a Saturday when a match is on and there was flexibility in my timings I would just go when the football traffic wasn't going to have any effect, so nearly all of the day, just like when you have a day off work and you wait till the rush hour is over before you go about what you have planned.
Its being made into a much bigger problem than it is, never get complaints from locals around Greater Leys at the moment because its an easily manageable situation, but without blowing this one thing up out of all proportion they are struggling to make a case against it.