Got some evidence of this happening?
I'm not saying it doesn't or won't, but this is the second thread where dropped valve seats are mentioned. If Chrysler is having a problem with dropped valve seates in either the 5.7L Hemi or the new 3.6L V-6 I'd argue that it is a quality control problem, as aluminium heads with steal inserts for valve seats have been used for decades.
Regards,
Joe Dokes