Yes, the resources change, but I can't tell you how often it does. I"ve heard every 7 days or so. Anyone else know?
As a novice armorsmith, I found my steady hide supply turned to junk overnight. The worst part is, I'll need neutronium steel to make Ubese, and this currently doesn't exist at all on my server (Tempest). Guess my next holo will have to wait even longer.