I think, the clue with the germans players (and with those like the both here) is that, they have really to want to come here, if we want to sign them.
Otherwise, why to set in a new league and nation (specially if they are from big clubs like Bayern oder Dortmund)?
They have the best WC players (the mayority in their own competition), one of the best clubs in the world, one of the most loyals fanbase in the world (particulary due to the "50+1 Rule", which allow clubs to be really some kind of "social societies" property of their own fans ),a very good and organised league, good salaries, so, why to change???
That was so with Hummels, Goetze, Neuer and now with Gündoğan and Reus....
But..... just my opinion.