I'm optimistic about the plans that Gunn & Safran have for the DCU. The talented writers in the DCU writers' room, the choices of comics(All Star Superman, The Brave and the Bold, Supergirl: WOT) for the announced titles from first slate have been exciting.
I just need more quality DC content on big screen and that's all I care about at this point. After a long time it seems that DC has a good plan for their shared universe.
And, as far as your question is concerned, considering the established worldwide fanbase of DC and its characters, if they get the basics right - the box office success should follow.