Maybe. I'm thinking it's the other way around: the PSO hooked up with Reference because there were problems with Exton. But because it's so much a matter of prestige, I doubt very much that Exton would cough up the Mahler tapes, particularly upcoming symphonies 2 and 6, to the PSO and Reference Recordings.
Let's hope SOMETHING happens, and that this doesn't become as ridiculous as the Mahler 8 issue between the Dallas Symphony and Delos (which is now about 12 years old).