I'd agree that there's certainly a market for Superman. And since BvS comprises mostly Superman's supporting characters, this film hinged on how it handled Superman (and Clark Kent).
Yet I also don't think the GA knows what they want out of Superman (keeping in mind, of course, that the GA is not a monolithic group). What the GA knows is the Donner/Reeve Superman, and the [general] Marvel approach; they might have some familiarity with Smallville. I don't think any of those popular approaches is sufficient for a character of such iconic import and loaded meaning as Superman.
And yet I think that's the key to getting Superman right - embracing just how important both his identities are. As Nolan's trilogy demonstrates, a film rises and falls on the basis of its supporting characters and villains. For Superman, that supporting cast happens to be the Daily Planet, the "home" of Clark Kent and Lois Lane. If WB wants to get Superman right, I think they need to find someone who can tell a story that supports and develops both the journalist and the hero, with respect.