> only over my dead body i would start wrap more and more layers on top of already virtualized infrastructures

Containers have little to almost no overhead, they bring more isolation (and i can't wait docker/selinux integration for more security), the FS layered approach allows to save spaces.
Yeah, leveraging containers is a waste of time ... I agree with Nicolas, containers are still immature at the moment, but that's part of our mission as fedoraproject.org to make such technologies mature and bring them to rock-solid.

best regards,
H.