I think that's what I just said!
Yamaha got it wrong, as the core organ sound was still in demand. I never did like the US1, only 4-operator FM orchestral voices and no organ flutes, just a set of organ presets. There was a famous ad in Keyboard Player at the time, asking "What's the USe of an organ without organ sounds?", capitalising US in a lot of its wording. To the best of my knowledge Yamaha never challenged or complained about it.
And there's still a core of people, albeit ever smaller, who still want organ sounds, along with everything else, hence the few companies that are left catering for it.