You're construing the fan factions like they're numerically close to each other. Which is it? Are the number of people who support this ending and the film in the majority or not?
I've got to admit that I have a hard time understanding you sometimes
(English is not my first language anyways)
So if I correctly interpreted your question, you're asking me how big the support for the ending and the movie is, right?
Before Ch. 699/700 and The Last, the shipping fandoms had shipping wars with each other, but it did not take over the entire fandom. Now that a month has passed, the fights have escalated and gone beyond the border of shipping wars. And that is b/c the fights are caused b/c of the way Ch.699/700 and The Last are presented to us: fanservice and romance. I would love to discuss the ending outside the shipping context (we all know that the ending is flawed is so many aspects), but that is what people mainly feel like talking about. I go on youtube or tumblr, and all I see is bashing and verbal insults towards each other's shipping fandom.
I don't know how big the support is for this movie although I'm inclined to assume that it is bigger in the western than in Japan itself.
Sorry, if this answer is not answering what you were asking 