There's no functionality for this and no plans for such functionality. Simply put it'd crash 99% of our user bases servers. The best way to mass-resize is to do so locally with GIMP or Photoshop in a batch operation. It's possible to do it server side, but you'll need to write a custom script for it.
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I have the regenerate functionality in seblod regenerating 5000 images in one go and my server does not crash. So I think CB would do just fine as well. Anyway I did as you suggested, Thanks.