Those two may not be, depending on how WW is portrayed; while I do tend to side with the argument that Batman should exist in a world entirely separate from "real" (as in super-powered) superheroes, I think the big problem combo is Supes and Bats. I might indeed be much more interested in a Bats-free JLA than a JLA with him.Why is Batman and Wonder Woman any less doable than Captain America and Thor?
But really, it all boils down to The Man of Steel, does it not? As someone said above, it's not hard to keep Batman profitable, whereas DC's other biggies are much riskier bets at this point. So, we'll just have to see what sort of seeds that movie sows, and how well it does.