I was reading the requirements for the ongoing "Horizon 2020" EU grants. It explicitly indicates that the vehicular language for these grants is English. Not only the application must be written in English, but also any partner institutions located in different countries agree to communicate in English.
However, with the impending (ok, maybe not so much) Brexit, I am wondering if it is still justifiable to keep English as the main language for EU-related activities. Granted, Ireland will still be in the EU, but other countries such as France or Germany are already today much more economically relevant within EU and will be more so after UK leaves.
Do you think Brexit will cause a shift towards, say, German or French? Or the preponderance of English as the de facto language in the world will still be too much of a factor to overcome?
EDIT: To clarify the question to those who say it is a duplicate of this: As addressed in the comments, I do not doubt that English will not be dropped as language within the EU, because of Ireland and to a lesser extent, Malta. My question is about the prevalence of the language, if it will be relegated to a lower status in favour of French or German. Notice also that I'm speaking about the EU as an institution, not about communication among citizens of different origins.