The French do not really fight changes in the language. The just like to post articles in the media about it. You cannot force people to use or refrain from using this word or that. Years ago, I was a passenger on the Ticabus between San Jose Costa Rica and Guatemala City. There were 68 seats on the bus and there were people from 37 different countries. The driver would ask everyone for his passport, and then present all of the passports to the customs people. After a half hour or so, he would return them all stamped. Leaving Costa Rica, a Panamanian kid bought a bottle of rum and drank way too much of it. At a restaurant stop in Nicaragua, he managed to get himself arrested for public drunkenness, (as I recall, he threw up on some merchandise) and we took up a collection to bail him out. I think each of us had to part with something like a dollar and change. This led to a lot of discussion between passengers. Almost everyone spoke some Spanish or some English, and as I spoke both, I spent a lot of time explaining how the drunk promised to turn over his bottle to the driver and drunk no more. The Europeans mostly all spoke English, others spoke some Spanish. There was one Bulgarian kid who only spoke Bulgarian and a bit of French. The parley took about an hour. The money was raised, the drunk bailed out,and we were on our way again to Managua, which was where we spent the night in some sort of hostel cobbled together out of 4 X 8 sheets of plywood. This was about a year after the horrible earthquake
There will not be a "European language". Europe will be like Catalonia, where all the Catalans speak Catalan at home and to each other, and Spanish to all who do not understand.