In the real world the general consensus for Ghostbusters (2016) is - "Eh. The trailer didn't blow me away but I'm willing to go into the movie with an open mind." That mindset & the people excited for the film makes pretty much where 97% of the people who pay to see the film are coming from. That's the audience that will make or break the film financially.
In the online world, that remaining 3% of the audience is the vocal minority & they're the ones who are hating on the film for starring women. That's the same audience who as a group is "disliking" the trailer on Youtube so that becomes a story. That's the same audience who is saying the movie will flop hard. That 3$ is also the same audience that news organizations worldwide give far too much credence too simply because that small, hate-filled audience does little more than make noise on the internet to make themselves seem larger than they actually are.
In reality, I don't think many people care whether or not the film stars women. Just that the movie works. And a bad trailer is just a bad trailer. Marvel movies have survived them, dramas have survived them, Inside Out survived genuinely awful trailers, & Melissa McCarthy/Paul Feig's previous two films - The Heat & Spy - both survived absolutely cruddy trailers. If people start seeing or hearing the movie is good they'll go see it & not care.
The hate will be continued to be spread online. But, it will be spread online like how a similar group is spreading hate towards anyone who says "Batman V. Superman" was less than amazing.
Also, Ghostbusters (2016) is fighting the same stupid bullshit battle than every other mass-appeal non-romantic comedy of the past decade starring women has had to face. The "Do women want to see a movie starring women that isn't a cookie cutter romantic comedy?" question. Usually it's just a case of mansplaining - "Women can be lumped under one generalization so they won't go see X because of Y". In the end, the answer has almost always been yes, they'll see the film if it appeals to them as an individual.
Every year there are three or four weekends when box office analysts, studio heads, nerds & the world as a whole realize "Gasp! Women like all types of movies too!"
Seen a lot of people on here make presumptive calls that Ghostbusters (2016) is going to flop. All based off a silly 2 minute trailer. I genuinely believe Ghostbusters has a great chance of outperforming X-Men: Apocalypse, Warcraft, Independence Day: Resurgence, The BFG, & Star Trek Beyond. ALL of which are films with much Much MUCH higher production & marketing budgets.