There is now a pro-granny-flat state law, a green building density bonus, a low income density bonus, and plans by the city council to reduce regs that will take 3-5 years if it ever passes.
None of these will even come close to making up for the fact that there is no longer any large tracts of developable land unless you go way up to Vista/Valley Center or down to Otay.
The number of single family houses in San Diego and inner suburbs will only decline even as our population and economy grows.