While I agree there is nothing in the history of Atlas O since Jim Weaver's untimely death to suggest they are going to be a force in this segment of model railroading, the future could be different. I think a lot depends on market forces. If some combination of more people entering the hobby and pandemic induced more time at home leads to more purchases by those who are committed to DCS locomotives, Atlas O could become a significant maker of locomotives, in contrast to their recent history. We'll see what happens. On balance, I suspect they will be bigger than the almost nothing they've been doing, but more a niche role that Weaver had rather than a major force, as MTH was. But I've been wrong before .
You're right, we don't really know but it's fun to speculate. One thing I do know is that in in the long run, supply and demand will come into balance. At the moment, and I stress AT THE MOMENT, the Rail King line appears in jeopardy. If that's truly due to lack of demand, it will naturally disappear; if it's not due to lack of demand, I'm confident something will appear on the market to take its place.