The short answer is that yes - we are moving our cows to all A2A2 as fast as we can.
For over 10 years we have been testing our younger generations of cows and calves to determine if they are primarily A1 or A2. We are using only A2A2 bulls and are now testing every spring group of calves. We are approaching the 75% A2 mark and believe that in another 5-10 years will be 100% (or very nearly so) A2A2.
For a good source of information about the difference between A1&A2 milk visit this website.