Older iPhones will probably be sought out by retro collectors in the future similar to how old game consoles and computers are collectible now. I remember when you couldn’t give away old DOS PCs and CRT monitors and now they are sought after by retro PC collectors. I could see the early skeuomorphic versions of iOS being sought after by collectors in the future. They’ll want to sideload old apps and tinker around with the OS which is a lot easier to do with a jailbreak.