If passed into law police would still need to get a court order to see them. Another problem, who's going to pay for your phone company to store all those text messages for two years? You guessed it, the cost, most likely will be passed on to you.
Proponents say it's nothing new. With court orders, law enforcement can already get access to anything that's available from phone records to emails. The problem is text messages aren't recorded on servers like your email.
According to the ACLU most of the top major cell phone carriers don't keep records of your text messages for very long. That's the reason behind the push. To make phone companies record them for 2 years.