Being predominantly a collector of O gauge product that fits into the "other" category I personally do not have concerns. 95% of what I am interested in that MTH has made is available on the secondary market.
If anything, Atlas's acquisition benefits both MTH buyers and Atlas buyers as it gives Atlas a factory that can hopefully deliver former MTH, Masterline, and Trainman product more efficiently than they have in recent years.
Lionel's acquisition of some of the Premier steam tooling gives them access to decent scale locomotives that can be offered at a price point that is below the Vision Line product and ultimately provide Lionel with a more consistent revenue stream in proven tooling.
DCS being a separate company may help alleviate some of the command turf wars that have plagued the 3 rail world forever as it does not necessarily have to be associated with any one manufacturer.
The reality of today's O gauge market place is there is no "large customer base" as mentioned in the OP. I don't see that as a negative or a positive, just a reality.
