Doing so strikes me as being impractical in the extreme. English would still be the the lingua franca in every other domain, so it would just mean that European

Doing so strikes me as being impractical in the extreme. English would still be the the lingua franca in every other domain, so it would just mean that Europeans would have one additional lingua franca to have to learn. It doesn't matter how easy that language is to learn, it's still an extra, and almost certainly redundant, effort. I'm not going to bother finding the hyperlink for the relevant xkcd comic, because we've all seen it before.