That has never been confirmed and I sincerely doubt Blizzard can track the opinion of 40 million players to find the majority. It’s sorta clear that they were going off of the online community. (Forums, reddit, YouTube etc.) With that in mind, they should have no problem addressing how we feel about Mercy. 
Nope, because as of now, we don’t know who the majority and minority is. And even if I was going to argue like this, things point at us being the majority. How? Let’s use Titanium’s thread as an example. It was 1650+ likes and the main subject is how current Mercy is not fine, the main reason being, fun. Now, let’s compare this to a thread that claims that Mercy is fine and fun. Since Titanium’s thread is the most upvoted thread in existence on the forums, we know Titanium’s thread wins by a large margin. If we were to use that as a sample size, it would point at a large number and or majority not having fun with her. That is a huge concern that definitely should be addressed.
Edit:
There’s also this that further suggests that those who dislike her current state is the majority. 
It also gives percentages on how many people find her fun and unfun.
/End edit
𝓣𝓱𝓮 𝓜𝓮𝓻𝓬𝔂 𝓘𝓬𝓮 𝓒𝓻𝓮𝓪𝓶 𝓜𝓸𝓿𝓮𝓶𝓮𝓷𝓽
