Normally you configure your a record to point at the cdn as the cdn is the thing that gives you multiple points of failure (caches all over the world). Hard to

Normally you configure your a record to point at the cdn as the cdn is the thing that gives you multiple points of failure (caches all over the world). Hard to have a fallback to that. Running multiple cdns would be extremely expensive. Cdn caches are kept useful by traffic running through them, so hard to have a backup for that too.