I'm a hi railer, but much of my stock is from people that make or have made the stuff with either 2 or 3 rail running gear as an option.
We can't say for sure which way o scale will go, and I'd venture to say that people the year I was born were probably saying the same thing about Lionel.
As for Atlas, now that Weaver is gone, Atlas is my go-to. But even before that, Altas made CNJ 21000 boxcars and fishbelly hoppers, in steam and diesel era graphics, when nobody else did. When I worked for the NYSW, Atlas was the only manufacturer that sold accurate models of NYSW equipment.
As for o scale in general, some, not all or even most, but some hobby dealers have displayed a bad attitude about O scale because it doesn't "pay the Bill's the way ho and n do. I remember patronizing one of the first Weaver dealers in my home state, and he had tons of freight cars on the shelf. People like me flocked to the place, because they couldn't get it anywhere else, and this was when the internet was in its infancy.
Problem was, once the weaver sold out, he was very sporadic in replacing it, because "o scale isn't that popular", and he acted like he was annoyed when we asked. A year or two after that, the store folded, with lots of ho still on the shelves.
I agree that we're a much smaller lot worldwide, but if you get lots of o scale customers, you can't afford that kind if attitude.