Should Batman's cape be CGI? Snyder proved with 300 and MOS you can do far more visually with a cape if it's cgi. And since the cape would likely be black, or a very dark blue (if they choose to revere the comics to that extent) the CG shouldn't be too conspicuous.
I'm not seeking forgiveness for what I've done, Father. I'm asking forgiveness for what I'm about to do