At least California appears to believe RR Alfalfa will be in play again in the not too distant future.
They have top and center their Bullition;
Avoiding Weed Shifts and Weed Resistance in Roundup Ready Alfalfa Systems. plus others
http://alfalfa.ucdavis.edu/+producing/index.aspx?cat=Biotechnology%20and%20Roundup%20Ready%20Alfalfa

California may not be the very best state for nation wide alfalfa information but they do a great job with information of interest to their growers, to start with and for the Irrigated, Arid Western grower. This is not a big surprise seeing alfalfa is a major cash crop in California.