Germany has the best, most diversified economy in the EU, and things have changed since the Thatcher days. I have family there & I can tell you that the German people have had it with immigration & diversity.
The German people do not have control of what their government does to them. The consequences of Schengen were designed to provoke this response among them and in all the other countries that agreed to it.
Furthermore, Germany is a social market economy (not a free market), and has been playing beggar thy neighbor with the rest of the EU to get where it is. The treaties of the EU impose the social market economy on the member states, and the euro’s one-size-fits-all interest rate scheme was deliberately designed to favor the German bloc. Therefore much of what Thatcher predicted has come true.