First of all, I don't understand why the French government wants to do that - it's quite ridiculous. However, I also suspect that it has to do this kind of public stunt to satisfy the conservative right wing, especially with the presidential election next year.

Furthermore, I think you are missing something quite fundamental here - French is pretty much one of the core building blocks of France, and no, this is not obvious. 150 years ago, not many people spoke French in France : they spoke Basque, Breton, Occitan, Corsican, Alsacian, and various forms of patois. What brought French everywhere was compulsory education led by missionary style teachers, world war I, and forbidding people from speaking their regional language. In essence, the language was a political tool to unify the country, and the French never stopped considering language as a political tool.

You may assume that this is 'arrogant nationalist French' behavior, but I will disagree.