I'm hopeful that it could happen. Really depends on when a successor launches. The earliest I could see a successor launch in which Switch reaches lifetime sales of 160 million would be Holiday 2024 (which is when I'm personally hoping Switch 2 launches). Anything earlier than that and I can't see Switch reach 160m. Anything later and it just becomes easier.
It's also still possible for the successor to launch in Holiday 2024 and for the Switch to fall short of 160m and even fall short of passing DS & PS2.