There were many lingua francas of which French was supposedly the first global lingua franca. That changed and it became English (from what I understand). We will probably see another language become the lingua franca, so my question is: should it be English? Are there better candidates out there? Why / why not?
So it looks like it might be either German, Spanish or French, depending on how you would assess it. No surprises there.
Now to convert everybody, not so easy ;-)
Germany, Spain, and France didn't get it done in the 70 some years since the WWII, so my estimation of that changing is quite low. I think France is too chauvinistic to accept German due to its history and what the language sounds like. Spanish and French are too similar and France would again consider its language superior once again 😅
Now to convert everybody, not so easy ;-)
It could be done with heavy investments in education across the EU. It would have to be for all citizens and not just schools for <20. Adding it to every EU country's list of national languages would also help adoption, as government media would have to be broadcast in them all. If the EU were serious, it could happen within 20 years, I reckon.
As a German, I would not want German to become a language of communication within Europe. The comparative political power of Germany within the EU is already too high, smaller Eastern and Southeastern EU members already have had to form alliances like Visegrad.
Ireland being the only country with English as major language within the EU makes English actually a more neutral language than languages of the populous countries. One could call it European English.
Maybe Sámi languages, Basque and Maltese could come together and form the most distinct language that is most neutral? /s
Nah, that would take the last bit of joy out of the German political system's misuse of the EU commission as a toxic waste dump for politicians who have become too bad for domestic use.