I expect mobile OS and maybe mobile app developers to do so.

Google has already downgraded memory for their upcoming Pixel 11 while at the same time imposing local running models as a first-class feature. Both decreasing the memory pool and increasing the demands on it.

The key is that they own the full stack (hardware and software) and can demand the OS be more efficient, along with perhaps forcing that goal on app developers as well via tightened background limits etc.

Google has done multiple Android memory reduction sprints over the years.

The problem is that things go quickly in the other direction between these sprints.