I completely agree with what was just said.
The principle of territoriality must absolutely be strengthened in the legislation. However, how far can that be taken? Some very good examples have been given, but, once again, will that be enough? As a demographer, I think the fundamental issue will be the future behaviour of the fertility factor, and as long as we are struggling on that front, gaining a few thousand people every year through the measures implemented will not be enough.
As for the principle of territoriality, I am thinking of what happened in Belgium, where I come from—as you may guess from my accent—where territoriality applies in Flanders and Wallonia. It does not apply in Brussels, where immigrants are given the choice. The result is that 90% of immigrants choose French.
In closing, I would say that a potential measure to implement would be to increase the percentage of children among immigrants, as everything is decided at a young age.