They already said that Cloud in Remake wouldn't share his AC personality. They even referred to him as "Prime Cloud".
AC Cloud was perfectly fine...in AC. He had a justification for his personality, and the movie showed that he had overcome it.
The problem is everything afterwards were spinoffs and crossovers, and since AC Cloud was the most familiar at the time, that's what they went with.
I suspect there's going to be a lot of grumbling when Remake comes out, where people will insist "That's not how that character is supposed to act!" when in fact it's nostalgia (and a bad translation) that hinders their memories.
Oh please. Advent Children is a glorified tech demo that barely gives any character a moment to breathe when they're not fighting some Diet Sephiroth concept art castoff. Pretending that anyone has to respect that version of Cloud (or anything from that movie) is laughable.