I definitely think we'll write tools to analyse the permissions and explain the worst case outcomes.

I can accept burning tokens and redo on the scale of hours. If I'm losing days of effort I'd be very dissatisfied. Practically speaking people accept data loss because of poor backups, because backups are hard (not technically so much as administratively), but I'd say backups are about to become more important. Blast limiting controls will become essential -- being able to delete every cloud hosted photo is just a click away. Spinning up thousands of EC2 nodes is incredibly easy, and credit cards have extremely weak scoping.