I think that the majority of them will realize that salaries for academics are pretty low compared to the US, and they will either join private labs or professionalize.
€10K seems high to me. In France it would be lower than that, I think, save for maybe a handful of outliers. Google search suggests top earners in physics in academia in Germany is probably between €80K and €90K, or maxing out at €7.5K a month.
