Board Thread:Questions and Answers/@comment-96.48.230.104-20150210084429/@comment-6697950-20150210100131

This has been asked hundreds of times and the answer is still the same - Kazuto and Asuna are a couple in real life and since the author seems to believe in true love, there isn't much chance that their relationship will ever be broken. As for their progress, Kazuto asked her to come with him and study in America. But on the other hand, he hasn't even built up the courage to meet with Asuna's parents at their home.

And what you've heard is most likelt either speculation, or the web novel, since the light novel version of Alicization is only halfway done.

As for Asuna's importance in the arc, she has a secondary role in the first half of the arc, but then joins the main cast in the second half.