Yes, others should be able to do this too, and the change is larger memory chips.

The next big step is Medusa Halo, which will have a 384-bit LPDDR6 interface. Those should be able to support 256GB at release, with 512GB coming later with larger chips (But I don't know to what extent people should trust the memory vendor roadmaps.) I'm not sure if they will be out in a year. Probably will be in a year and half.