That's actually what we did. From pilbox's docs:
> It is not intended to be the primary source of images, but instead acts as a proxy which requests images and resizes them as desired.
We fetched from S3 on-the-fly while caching the generated image using a CDN we already had at hand. This is a band-aid for the night (we're in India, it's 2 AM here) and not for handling daytime traffic. We're obviously hoping imgix will fix their issues in the next several hours. Even if not, at least our customers get a degraded experience than a broken one.