That sucks, I just bought a Bronica GS-1 with a 220 back; now I can't use it
I never really liked 24-exposure cartridges. I've shot enough of them because they were more easily found, but always preferred 36 - and I just take snapshots.
It's good I can still get Velvia 50 and Pro 400H, and I've always wanted to try Neopan.
Seeing some things discontinued is sad, but I prefer to see the camera half-full.
(Okay, I know someone will take my Bronica comment seriously. Don't. I am quite capable of sawing the gears in half )