It's not really essential for Batman to have white eyes. Plus unless you animated the top half of the mask to also be expressive (which would look weird), it would be irrelevant.
For Deadpool, having a full face mask with the character being as expressive as he can be made those kind of eyes completely necessary.
In still shots it can look amazing. But in live action it will look goofy. You can't have a animated Bat face like you can with Deadpool or Spidey. Just won't work.
I REALLY hope they do it with Spidey though. God damn that would be great.