You mean ichiruki?
It has problem with no romantic arrow from both of the characters.
If it has, it would easily the most likely outcome.
I think if ichiruki become canon, one or both of them will have a romantic realization or they just become canon like naruto without any development.
That's not true, especially that bit at the end. IchiRuki is just like NS developmentally. Just because they haven't said "I love you" straight up doesn't mean that they don't. It's clear with the way Ichigo speaks about her, and drops everything at the mention of her health, and through all of his dialogue about her "making the rain go away" that he has strong feelings for her.
Their development is right on line with how NS was, where neither straight up told the other how they felt, but it was implied many times over.