There are a myriad of possible reasons of why it flopped: nobody asked for it, it's been too long since The Shining, the long running time, etc. but some are blaming the short and weak marketing campaign. It only kicked into gear around 2-3 months before the movie premiered, and it was a case of "too little, too late".
It had a budget of 45-55 million so not really a tentpole, but it could end up making Warner lose as much as 20 million.
We all can agree KOTM wasn't a major success despite the long marketing campaign it had, but I'm not sure Warner can "save" GvK with a short one. If they make it "bombastic" and plaster the movie everywhere and have ads running all day it's going to be a major expense anyway, so not much saving.
But if they make it anemic like Dr. Sleep's, may as well brace for another flop.
Added in 7 minutes 35 seconds:
JGAR wrote:If anything, they’re either A) gonna drop an explosive trailer that’s gonna rival the Infinity War trailer in terms of views and reception (and should preferably during a major event like the Thanksgiving games instead of a random day like December 10th when its buzz and hype will get drowned by Wonder Woman 1984 and any other major trailers that will for sure come out during the week of Jumanji and Star Wars IX) or B) they’re doing a great job trying to keep production troubles and horrible test screenings under wraps.
Being realistic, it can't hope to match the Infinity War trailer in terms of views, let alone reception.
Don't get me wrong, I hope that whenever it comes out, it doesn't fail to impress. But the MV doesn't play in the same league as the MCU.
Option B would be sad, but it's also weird no one has "leaked" info from a test screening. I think the entire plot of KOTM was leaked several months in advance, in 4chan or a site like that.