You know what? At this point, the Fairy Tail fandom deserves a movie completely Nalu centric like what Naruhina got.
If you're not gonna develop their relationship in the main storyline, then end 100 Years Quest with a next gen reveal. Then give us the movie with Natsu realizing he's in love with Lucy and Lucy realizing she's in love with him. Give us a situation where there's a chance they may never be together again, give us the emotional push the two of them need. Then have them confess. Make it happen.
Because while these moments are great, nothing ever comes of them. Getting a single Nalu hug at the end of an arc or movie is not enough. Because the two of them do not have an exchange even remotely close to a love confession. Its why this ship is not my favorite in Fairy Tail. Because they are the only couple of the main five that have no confirmed romantic interest in eachother. And yet they are the most popular. So yea give us that movie.