That "new ignition system" that they talk about might be a new transponder that works with the new keys. Don't know much about them, but one would hope that the old transponder could be re-programmed somehow against the new key sets using some only-Chrysler-knows codes... But, if security is the big issue and that keys are matched to transponders at manufacture time, then maybe that is the case... But they should have notified you that it would require an entire new key-transponder set up. Trying to find service manual might help if you can reference that.