Fieneke, You have expressed your feelings on this subject much more eloquently than I could ever have done and I am English! LOL!
I think, as I already have said, that it could divide our lovely forum, but if we keep these different sections, I think it should be as a fun thing. For instance, my German is very basic and it was nice for me to test the small amount I know! It could also encourage those who are not confident in the English language, to talk on the main forum. The more serious and important discussions should be kept to the main parts of the forum.
The worst thing that could happen is that we become divided into our separate countries and talk amongst ourselves!