People said there wouldn't be a mobile-only Switch... Oh look. The Switch Lite happened.
I think that a mobile-only Switch is more in line with Nintendo's overall philosophy and market than a TV-only Switch.
Of course it's easy to say "oh it was always a sure thing" after it happened, but that doesn't change what people said before then. I was among those who said there wouldn't be a mobile-only Switch as it would go against the point of the system and be redundant, that they could just pricecut and value bundle the regular instead. Even now, I still don't think there will be a TV-only Switch, but I wont say it's impossible or that anyone is wrong for believing it will happen. I know no more than anyone else, only Nintendo can know for certain.