even if you were to only go by the latest stickied topic (Feedback thread) as an estimation of the forum populace, that’s still over 5000.
5000 people aren’t going to ‘approve’ anything that doesn’t have a blizz dev not on it: they don’t care.
Reddit is a separate context from the forums and generally doesn’t have the same sort of reactions, interest, and so on.
People have made lists of this sort of notion before, but they were particular to blizz heroes as a way to foster how the interactions will either be dependent on each other, or (if not a forced pick) how they would work a apart.
If synergies aren’t more specific in effect, then it’s really not all that different from someone picking Medic; she’s a lot ‘lower a tier’ a hero if she doesn’t have a pick for “special interactions” with her heroics.
Without little else than vague suggestions on the idea, then its not a “75% approval” because concept and names aren’t really all that unique and need more substance or specifics to engage audiences.