they are not bricking the units. just kindle store won't be available anymore, and the azw/epub version which is supported on your kindles won't be provided any

they are not bricking the units. just kindle store won't be available anymore, and the azw/epub version which is supported on your kindles won't be provided anymore by amazon anywhere. what is on the kindle will stay and keep working. if you reset the kindle, DRMed content won't work anymore.