What are the numbers to suggest that Balanchine is moving out of the core rep? At PNB, in the last 20 years it hasn't: there wasn't a huge amount of Balanchine in the last decade of Russell and Stowell's leadership. There are more companies doing Balanchine rep now than there were in Balanchine's time, but now with a formal process of "You must prove you can do a "starter" ballet, and if you can, this is the progressive menu," and, of course, there are the requirements for using the original sets and costumes unless there is a pre-approved new production (Mariinsky and POB "Jewels", PNB "Midsummer Night's Dream," PNB/SFO "Coppelia") that effectively prohibit companies from doing some ballets, like "Liebslieder Walzer," "Vienna Waltzes," and "Union Jack," even if they could field the right number of dancers.
My concern, voiced several times here, is that PNB has been more focused on the two full-lengths -- "A Midsummer Night's Dream" and "Coppelia" -- and will be focused next season (2015-16) on the newly designed "Nutcracker." I consider the upcoming "Jewels" a mixed-rep all-Balanchine bill despite the overarching theme, and at this point, I consider it a luxury because it's three short ballets, not because there was more Balanchine in 1995, and I fear that as a yearly production, "Nutcracker" will too often begin to "tick" the season's Balanchine box.
I just don't know what companies had a substantial amount of Balanchine ballets but are no longer doing them. NYCB is doing more non-Balanchine a little over 30 years after Balanchine's death, but it's not like they are doing a small number of his works. (They had been mixed the great works that most wanted to see with other things that many didn't want to bother to see more than once, and for the last few seasons have reversed.)
Did San Francisco Ballet used to do more Balanchine? Did Pennsylvania Ballet or Boston Ballet, companies that Balanchine himself gave rep to? Are we talking about Miami City Ballet?