Fallbrook/bonsall the area’s close to the 76 seem very buildable and there is quite a bit of land there yet, I could imagine 100-200K population there someday, they are getting the 76 ready I think for some of that expansion already.
The hilly/Rocking north/east areas are definitely much much harder to build on, especially as you get into De-luz
But there is still quite a bit of buildable land,
I think eventually (20+years) there will be a rail that serves the TV/Fallbrook areas and connects to the Oceanside metro.
Is it good/Bad don’t know, but it IS inevitable.