Torrey Pines is no architectural marvel, but it's a great location, with ample room, and produced a wonderful Open 5 years ago. Given that it's also a muni, I think there's a good chance the USGA goes back there.
Realistically, although I'm a WC guy and would love to see more tournaments out here overall, the West is pretty well represented in the Open given the options out here. Pebble gets an Open every decade. In recent years we've also had Olympic, Torrey Pines, and Chambers Bay is on the schedule.
I would say there's a good chance that 2021 or 2022 will be back in California somewhere ... either Torrey or Olympic, most likely, but Riviera or LACC also seem like possibilities.
Edit. It's really the PGA that should be out here more often. Since Sahalee in 1998, Tulsa is the farthest west that event has come. That's a shame. Colorado still may have concerns, but the thunderstorms are generally less common in August than earlier in the summer. Weather is great in the Northwest then. And all up and down the Cali coast is wonderful, as well.
Western PGAs in the stroke play era:
98, Sahalee
95, Riviera
85, Cherry Hills
83, Riviera
77, Pebble Beach
67, Columbine (Denver)
That's just a shame