If Google manages to prove it works and there are no better alternatives later on, then it will probably become the de-facto standard.

However, the second condition seems to not be met if Google is right, because they mention there are promising papers published.

­>Since we selected New Hope, we've noted two promising papers in this space, which are welcome.

There is also the fact that "as of now" efficient quantum computers capable to break our crypto is fiction.

Yes, but if you want your sessions that are captured today to remain confidential when quantum computers do become reality then you need to use post-quantum key exchange methods today.