I would rather (once again) raise the awareness of the active committers about "eating your own dog food" and use the milestone week to actually try the latest greatest nightly builds.
I agree that committers, and more, need to use the nightly builds and that it is a critical part of the project quality process. However, do we need a dedicated milestone week for that? Would there be some other/better way of achieving that result? And if we have some guarantees that all active committers are using nightly builds anyway, do we need a milestone/freeze week or can we assume that most developers using latest build is enough to find most issues? If not, what is missing for us to find such issues as part of our daily work?