As in, they don't manufacture TMCC anymore.
We'll never know what the terms are of the DCS license. But you are probably right that Atlas will offer only one command system. Either the antiquated TMCC that limited their sales, or the newly licensed command system. During the infancy of TMCC Lionel offered command and conventional versions of their scale locomotives. That didn't last long.
Wow. Traindiesel, when you put it that way (and after reading your other post) my guess would be that Atlas will go with DCS if under the license agreement that Atlas would get access to any new or improved sound files from the yet unnamed DCS entity. It will be an interesting year for O gauge.