It seems there are something like 150 million full French speakers in the world (Not many more than the total population of Japan), most in France, some in Canada, and most of the rest in bits of Africa that don't really matter as far as business goes, and most of them also speaking English.
That's against about three times the number of English speakers, the vast majority of whom live in economically important bits of the world.
France might very well try to insist on French being spoken in their own country, but there's bugger all chance of them ever making the slightest dent in anything outside that country.
This idiotic attitude (I know the common version of the story is wrong) being displayed here is a mix of nationalism being used in the absence of common sense and the fabled king's attempts to hold back the tide.
The French government are clearly a set of King Cnuts, and should hang up their crowns as the monarch did, admitting the French language has no hope of ever becoming a world leader, or even a serious contender within Europe.
As for making the French language the official language of Europe, try telling the Germans that.
As a note, English speakers from the South of Ireland can't be forced to speak French as European rules would forbid restrictions on EU nationals and France would have a fat zero any hope of forcing business to mess around with name changes and French language sites just to sell in one country, especially in a global market where companies are changing product names so they conform worldwide, not just in the odd country.

That isn't to decry French as a language, "Je t'aime" will always sound a lot better than, "Get your coat love, you've pulled", and where would we be without all the French words used in the English language?
Some online university or another claims about 40+% of modern English is derived from French, but most of their site is in so they can be understood by more people.
The childish "Throw their rattle out of the pram" attitude of forcing English speakers in that country to use French if the British exit the EU is very silly, and won't do the slightest good as they'll still have to speak English if they want to conduct any world trade outside of a few bits of Africa and a bit of Canada, that and French business knows what language to use, as do many French politicians.
Is French a global tongue? No, not really. It might well be used pretty much everywhere, but the vast majority of the world ne comprends pas, probably replying to a question uttered in French with something like, No idea, do you speak English?".
To prove my point, China isn't going head over heals in an attempt to get its population to speak French, and that applies to pretty much every other country in the world.
Basically, nationalism is daft.