Privacy and cost!

If the carriers are required to retain all text messages for two years the cost of storing them would end up on our wireless bills (visible or not). Approximately 7 Trillion text messages (160 characters maximum, each) were sent in 2011. It is a quantity that only increases year-to-year. The carriers would have to increase long term/archival storage in order to meet this requirement, and provide a mechanism for managing them (content life cycle management - when to store, when to purge, indexing them for search). The cost for both would most certainly be passed on to us.