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?
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