Talent isn't the issue (yet), Löw had enough options to field a strong squad and I'm optimistic that Flick will turn things around into a respectable position again. Even if it's not the same level as 2012-16.
That being said Musiala, Wirtz and Moukoko are three very highly rated young attacking players, Baku is looking like a possible answer on the right side. It's not as much talent output as there should be, but some of them will probably develop into valuable players for die Mannschaft. Havertz seems to have plenty room to grow as well.
If Baku were to work out that alone would already be a huge improvement, as that would enable a cohesive foundation to the team:
-----------------------Neuer/ter Stegen
----------calamity------Hummels-----Rüdiger
Baku----------Kimmich-------Goretzka----------Gosens
two actual WBs, who are natural fits in a back five and two CMs, who are complete enough to fill a midfield two with life.
To me it seems Low was just happy to see this tournament out and leave. He kept his sqaud selection safe, his first 11 and tactics were terrible and too safe and one dimensional. Bar Semedo helping them out with a nightmare performance they didn't look dangerous at all.
The production line seems to be a low level for Germany now. Ginter is not up to much, Hummels is nearly done, that leaves you with
Rudiger as about the best of them. Centre midfield is looking ok. Right back needs to be fixed, Baku might be that player.
With this squad there was a real lack of attacking options. Chasing a game and he brings on Sane and Emre Can on 87 minutes and leaves Musiala on the bench until the 90th minute.
Surely Draxler is as good as any of them, why was he not picked? You have Volland, Neuhaus sat on the bench, not sure they are really up to much at international level either.
Assuming the new guy keeps the 352.
Neuer/Ter Stegen
Rudiger, CB,CB
RWB,Kimmich, Goerextka, Gosens
Gnabry, *Werner, *Sane
That leaves about 3 players needed to fill gaps in the first 11 alone, and if you think about how Sane and Werner are performing, that leaves 2 more positions that could need filling.
Edit. Meant Rudiger not Sule.