Yuri has said that Ohara is moving from FPL53 in favor of FPL55, so they are thinking about the future of their APO140. They still have about 30 sets of optics for the FPL53 version, but that will end soon.
After that production of APO140 will be postponed for a short time so they can switch to a different glass combination.
They may move to Fluorite for the 140 because it “has more margin of safety.”
I hope I am understanding this all correctly but I find it very interesting.