It's only a benefit for the French researchers who can get a position in France. Those who can't are already forced to emigrate (and we're back to where we started) or to quit science entirely.
But retention is also a problem. How many of those scientists will stay in Aix-Marseille? Refugees, almost by definition, go back to their country once things calm down. And life in a country where you don't speak the language is not conducive to staying there long.
I'm not saying everything will be bad - there's a plus associated to getting great minds for cheap. But if I were a French scientist fighting for grants I would definitely feel odd about my country explicitly telling me "French need not apply".
But retention is also a problem. How many of those scientists will stay in Aix-Marseille? Refugees, almost by definition, go back to their country once things calm down. And life in a country where you don't speak the language is not conducive to staying there long.
I'm not saying everything will be bad - there's a plus associated to getting great minds for cheap. But if I were a French scientist fighting for grants I would definitely feel odd about my country explicitly telling me "French need not apply".