I think you're spot on. I've never seen a team, I don't follow Spain closely so perhaps they did. I'm also relatively young to preface this, go from looking great to just complete and utter crap in the span of what, 6 months?
This side has a lot of miles on their legs, played together for years. I'd be interested in your opinion, who goes, who do you keep?
It's a tough one as to who goes, cos of the 'old guard' there are for sure some who should be and will be around for the Euros - Hummels, Neuer and Kroos being the big 3 to build around still.
I am sure Müller will also be there too. Even though he along with Khedira would be two I'd be looking to phase out, Özil too, although as frustrating as he is, he wasn't the worst today. But the sooner Germany start playing Julian Brandt from the start the better, and he can play that central role just fine already.
Also Boateng is one who should be on his way out, not that he isn't still a good player but his injuries pile up, and I actually like what I see of Sule, and with Jonathan Tah in the wings too - time to bring in a couple younger central defenders. Mario Gomez' time is up for sure too.
So yeah - outs: Boateng, Gomez, Khedira. Özil and Müller are on the bubble - I can see the argument for phasing them out, just not sure if it will happen. Also, there really isn't a need to have Rüdiger in the squad either - not that he's old, he just isn't very good. Germany have other better options. I'd also like to see Philipp Max brought in in place of Plattenhardt, as he offers far more going forward.