Well India has a diverse set of languages spread across its regions. As I understand it, the degree to which English thrives there is largely because choosing any other administrative language would be seen as oppressive to the other languages. Again, only stuff I picked up from the various Indian colleagues I have had.

Point being; I don’t think that is any different really from Europe. If they can manage, so can we.

True, but they are one country in the end. We are not, and even if personally I do dream of European Federation, I know that this is an utopia that would have 0% chance to work in reality.