It's happening. They've probably had iOS on Mac laptops for 5 years at this point. Similar to when they had been compiling MacOSX on Intel for 5 years before switching off PowerPC. The cursor on iOS on iPad is the nail in the coffin. I'll make sure to ping you when it does.
Only ping me if it's in the next five years, which was the claim from the other poster. ;-)
We have until 2030!
That said, if macOS continues to receive such shoddy treatment from its design team, I may not be using macOS by then to even care if it's going out the door. I may already be gone.