ESCLUSIVO: L’esercito tedesco deve essere più del doppio di dimensioni, dice il comandante

true, France will feel much more secure with a much stronger German army at its side

This has been known for awhile, the issue is how to do it.  Germany also still needs to fix their military culture.  I have worked with the Heer several times and there are a lot of French military words like espirit de corps and élan that I would not use to describe anything in reference to the Heer.

mass immigration does come in handy, just send them to the front

Spend more money and pay higher salaries to attract people to risk their lives.