In the PPC-Intel transition, there were only 2 “hybrid” Mac OS X versions: Tiger and Leopard; while Snow Leopard was Intel-only but with Rosetta, and Lion and later totally Intel. Today, we have already had 3 Universal (Intel + Apple Silicon) versions: Big Sur, Monterey and Ventura. In theory, if Apple delivers the new Mac Pro this spring, they could ditch Intel support as early as macOS 14 (Sonoma/Sequoia/Mammoth/Redwood/whatever) while maintaining Rosetta 2, and pure Apple Silicon-only with macOS 15 and later. Probably, as you said, things will be more gradual, but the transition could also accelerate suddenly, once all hardware is based on Mx. Well, we’ll just have to wait for WWDC 2023 and see…
