In my opinion, German is too hard to express all managerial implications, so I prefer English
It was once to my knowledge before it lost its place to English. It may bounce back though.
Nowadays, English is accepted as a universal language. Although English is not an official language in many countries around the world, it is a common communication tool for those who speak different languages. Also, most of the scientific resources are in English. Therefore, the orientation to German will be more difficult. While there are more spoken languages such as French and Spanish, the German language will be less preferred. Also, as underdeveloped or developing countries are just learning English, this will reduce the global connectivity.
We studied in the postgraduate program that Latin was the common language in England, and the origin of English came from the West of Germany. I think the German language will occupy a higher position than the French, Russian, Spanish, and Italian languages to be directly after the English language. Germany is the country of heavy industry, the country of science and technology, and this unique attribute gives a great chance to their language to be widely spoken and used.
I am amazed by the sheer number of English loan words that have found their way into German despite there being acceptable German equivalents. But I think German is hindered by its grammar, namely word order and inflection. Also the penchant for long compound nouns makes it unwieldy:
Der Donaudampfschifffahrtsgesellschaftskapitän befolgt dem Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz.
To the extent that it deserves to be, as with any other language.
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Re Pfeifer's comment on English words supplanting acceptable German equivalents: Sometimes an English word has a specific universally understood meaning, such as today's use of Lockdown - government mandated Verschliessung.
The Greeks say everything is Greek. Maybe we'll switch to Greek? This one is very difficult. And today's English is Latin of Europe.
Since most people in Europe speak and understand English it would be very difficult.
Sure it would be difficult. English remains, but it is also worth knowing other languages .
Although Gemany is the most powerful economy in EU, German is not spoken nor written in many European countries. On the other hand, English language is well-known in almost every country in Europe. Furthermore, the first and foremost purpose of science is the communication of information, so it is better for not only Europe but also the entire world to continue using English as an international and scientific language.