A couple of points.
Trying to put on my general audience hat, they probably didn't like the last one (BvS) - too dark or different to what I wanted or expected, over the year when they saw JL they saw
1) Gal and Ben
2) Troubled production headlines every now and then
3) S*** reviews
The last one basically nailed the coffin.
So Gal and Ben are now the face of the franchise (Henry's not even in 99% of the promos), if Gal didn't turn GA off, who did?
---------> someone high profile, had a divorce with a celebrity wife, went to alcohol rehab, and announced he's quitting directing Batman, and the "will he, won't he drama"
*Back to fanboy hat.
Is that gonna boost or harm the movie?
That's why I think Affleck's really the face of the universe, not Henry, and I'd argue him leaving and let Gal, ?Jake, Margot and ?The Rock be the face for now would benefit the brand.
Please let me know if there are GA who just hate Henry Cavill, I've chatted with clients who like CBM and is a Deadpool fan, he didn't watch BvS and the first thing he asked me was "is it that bad? must be that guy...Ben Affleck".....ok we Kiwis really dislike him for Argo (there's a line of "the kiwis didn't help") and I've heard at least 2-3 real life people just...dislike him? I've never heard of any random/real person bad mouthing Henry though, and his live interviews are just so lovable...