Jail breaks shouldn't (need to) exist, but physical presence triggered introduction of a new root trust should be a mandatory for locked down hardware.
Jail breaks are always a stop-gap measure, since they're quite obvious against the interest of the system designer, and so they'll work on plugging the holes.
At some point they will develop the safe methods themselves, and if we "shun" public work in that area, only jails will be safe, not the open spaces - which, among many other things, would be a PR nightmare for general purpose computing (Example: Apple and their "safe", filtered appstore).
Jail breaks are always a stop-gap measure, since they're quite obvious against the interest of the system designer, and so they'll work on plugging the holes.
At some point they will develop the safe methods themselves, and if we "shun" public work in that area, only jails will be safe, not the open spaces - which, among many other things, would be a PR nightmare for general purpose computing (Example: Apple and their "safe", filtered appstore).