There are so many factors involved that it is hard to say exactly what will happen in the future. How many total you have, how many roosters, age differences, how big an area do they have, do things happen that shake up the flock dynamics, do they have to spend a lot of time close together in the coop where they cannot get away from each other. Unless something happens to drive them together, maybe like a good rooster that will keep all his girls together, I think they will tend to go their separate ways. Even if they are all raised together, they will often split into separate groups, especially if you have multiple roosters.