If there are a lot of young players in the team, maybe Arsenal will not be able to perform very well next season. It takes time for the understanding between the players to be good. However, since Arsenal coach Mikel Arteta wants to rely on youngsters, I think Arsenal will become more stable and strong in the next few seasons.
Arsenal have moved in the transfer market this summer by recruiting young players to add depth to the squad. I believe Mikel Arteta is capable of polishing young players for Arsenal's long term investment. But it must be noted, big teams like Manchester City and Liverpool next season will still be difficult opponents.
I think the best targets for Arsenal and manager Mikel Arteta next season are the top four.