Serge Gnabry, at 19 years, has a lot of time to develop his game and has technical ability to be a major asset for Arsenal in the future. However, his immediate future might lie elsewhere than Arsenal. In hindsight, maybe Arsene Wenger brought him into the first team fold a bit too early. There is no denying he has played quite well when called upon but Wenger has quite rightly removed him from the spotlight.
But there is no way Gnabry can go back to playing under 21 football. That will be quite regressive. The problem is Arsenal fans want more success after winning the FA cup, more specifically, they want Premier League success and more. There is no way Wenger is going to deliver the Premier League while trying to develop a player no matter how much potential the player may have hence the class of players Wenger has bought this time around.
It is true there are some young players Wenger has bought and immediately introduced to the first team but it is worth noting expectations were not as high as the current situation. Theo Walcott and AOC fall into this category. Then you have a special talents category for Cesc Fabregas who broke into the first team by 18.
I believe Gnabry is more like Jack Wilshere, a player with massive potential who went on loan to Bolton Wanderers becoming a fan favorite and preparing him for the rigors of the Premier League. Gnabry would also benefit from a spell away from Arsenal especially to play in a team like Southampton or Newcastle if rumors from Daily Mail are anything to go by. Of course, Gnabry may have so much belief in his ability and may decide to stay and fight for his place and hope to get his chance in the League Cup. This might prove easier said than done especially when you consider he has Podolski, AOC, Walcott, Sanchez, and Cazorla ahead of him in the pecking order.
A loan is what is required to tap Gnabry’s potential and when he comes back, I believe we will see a more mature player.