We will love to have Gundogan in the team next season. It is tough to see Xhaka leave the club after a long time and that will really leave a position free in defensive midfielder in the team. There are however reports of Arsenal interested in Declan Rice and Youri Tielemans as well is reported to leave for free in next transfer window. So there are lot of options for Arsenal to sign a player in that position. What we need is a player who is young and has good experience of PL and Gundogan is 32 right now. Although I think it will be good to have him but I am not sure if that's the actual plan for Arsenal right now.
Will see about that in June-July when there will be update but right now it seems Gundogan is focused on the remaining games for City.