The theoretical process of upgrading the CPU on the Framework is buying a new motherboard from them, so sockets (there aren't really socketed mobile CPUs anyway

The theoretical process of upgrading the CPU on the Framework is buying a new motherboard from them, so sockets (there aren't really socketed mobile CPUs anyway) and chipsets changing wouldn't be a problem. How often they'll actually have new options, how much they'll cost, and how long they'll stick to the compatible form factor from these initial units are definite question marks that will only become clear over time. For Framework themselves, assuming they survive long enough for it to be a problem, the balance between new customers and entirely new machines and upgrades (and what that looks like in terms of margins) will presumably be a potential challenge, also.