Depp would need to win something legal before they feel its "safe" to paint Heard as the abuser, especially given the current era we're in.
Yeah it does seem that way which is why winning the actual case is so important even as Depp seems to have overwhelming public support outside of mainstream news outlets.
Depp got his story out there at the end of the day, and at minimum I think made the plight of male victimhood in general much more visible and a bit less stigmatized (this is true even if you think Depp is the primary abuser), but I'm also curious about how Hollywood studios will look at him if he loses this case and mainstream news sites are still firmly against him. Could well end up that both Depp and Heard are ostracized. I think Heard is probably cooked either way this goes, at least for a time.
Like that one Hollywood accountant or agent (I don't remember exactly who) testified, that everyone already knew: Hollywood is purely capitalistic and just looks at what will make money and basically nothing else. So they'll do their calculus to see if Depp's rehabilitation among portions of the audience offsets having lost these legal battles and being on the bad side of big news outlets.