Here's the big, most significant question: Why, if they were rebooting Superman via Man of Steel, did they not follow up that mediocre title with a reboot of Batman in his own film? A proven money-maker when done right could have lubed up our entry into this whole BvS thing if they planted the seeds of Bruce Wayne's antagonism against Supes in a Batman solo flick, perhaps introduced the Wonder Woman cameo there, more casually, just as Diana Prince and not her true heroine self, but implying she'll be there to kick ass either in her own solo movie or, which would be appropriate at this point, Bats V. Supes? They could maintained their darker, quasi-adult tone and still copied Marvel's formula with a few solo films before bringing the big group together.
Instead they've blown their big wad on something panned by critics and most likely won't even reach 1 billion (though they only need 800M to break even) and it's making them think twice about the roster they already had planned. And since both Suicide Squad and Wonder Woman are already either in production or in post-production, they can't exactly change them without it either costing a fortune, delaying the release, or degrading the product. At what point will it occur to someone upstairs to get the average Joe's point of view on what makes a good superhero movie?
But who knows, maybe Suicide Squad will be a sleeper hit. But honestly, when you have to introduce almost 12 focal characters in a single film, and the concept of magic, that seems highly unlikely. At least with magic, you could have introduced and perhaps elaborated on that in a solo Wonder Woman movie. Ah, lost opportunities.
I know Fox swallowed their pride with Fant4stic and asked people what they thought should be done with the property. WB should be doing some version of this with the DCEU. Maybe ask some of those people who worked on the old animated shows, you know, the ones that were critically acclaimed and won awards, for their opinions.