Yes Doug I am asking that and it's not unreasonable to do so. These were not Kodak Instamatics and we don't live in a world where resources are inexhaustible.
When I bought a system that P1 promised was designed to evolve, I had faith in them and invested heavily in a $100,000 ecosystem of Blue Ring lenses and accessories. At least trying to avoid built-in obsolesence is the basis of smart design, and responsible corporate citizenship. So if from its inception P1 had bothered to put in SD cards too (like Canon), or at least planned to be able to retro-engineer the adaptation we'd not be looking down a gun barrel.
But silly silly me, I did it to earn money for me, and my family, not for Phase One. They are a means unto an end, not an end in itself.
Yet your point about cards is partly relevant - B&H have some SanDisk Extreme Pro. Lexar, as endorsed by P1 upon XF release and accompanying XF with purchase, have vanished. Others, and 2nd hand ? ..hmmm.... perhaps the Kamakuza Jolly Fortune brand is OK for you but ... I wouldn't trust it.