If Dudley can send us magazines, that would help. Maybe other things too. Books, music, information on their technology. We need to know about that too, I think.
Oh, apparently Parvati had a vision where she saw the end of our civilization. Firenze convinced her to go to the Ministry about it, and it's possible that the vision she had is what pushed the Minister, eventually Hermione, into doing all these experiments and bringing about the end of our civilization. In trying to avoid the prophecy, we might have brought it about.
This is, I think, how prophecies generally tend to work.