I can only speak to the two bigger German banks (i.e., Sparkasse and VR banks), but if you look at their outsourced development providers (Atruvia and Sparkasse Informatik), they're still offering incentives for their apprentices to learn COBOL, especially in the german dual apprenticeship programs which they can steer more easily than university courses. My wife has been doing COBOL for one of them since 2012, and the demand has never diminished. If anything, it's increased because experienced developers are retiring. They even pull some of these retired developers back for particularly challenging projects.
Sparkasse and VR aren't the two largest German banks. DB is at least double the size of Commerzbank which is again 100mn in assets ahead of DZ. I don't find it all that surprising that these small banks are still trying to keep their legacy systems alive, but it's not the case for the bigger boys. (Source: work for several of them)
