Using GT as a reference point when it was stated that GT was a filler series :lol
People need to understand that the term canon, promptly doesn't exist for Kishimoto's home country. It's over here that the term sways itself. Since I'm from here, I understand roughly. We usually consider only the Manga canon, or what-ever Kishimoto does personally.
In Japan, anything Naruto related is canon. Though it's universally understood that fillers, aren't canon. I dunno why this point was brought up, considering fillers are used to fill up space between two points, usually done when an Anime reaches the Manga, but SP abuses this way too much.
The new upcoming Manga featuring the next generation, basically has Kishimoto's approval. He stated it in Jump Festa that he was done, but he was going to write/draw a Mitsuki One shot. The Boruto Manga itself, was given to two different people to take over. This isn't a Movie, an anime episode, this is a Manga. It isn't something you can dictate whether you view it as canon or not based on fan opinions. The only person that can say so is either the authors of the Manga, or Kishimoto himself. If you didn't already know Kishimoto gave the rights to someone else, in the lateral term (not as in handing everything Naruto to someone else), but giving the rights for someone to make a Manga from his own series.
What-ever happens, good or bad, doesn't change the fact that this is a serious series.