Lionel abandoned TMCC? You can run TMCC locomotives with the CAB-2 so there is backward compatibility......
......As for the option to use the DCS license, it could be included with the MTH tooling at no additional cost to Atlas. In any case, I would find it hard to believe that Atlas would market O gauge trains that could come with either TMCC or DCS. It would be a complicated approach to the market. That’s why I believe that Atlas will only offer one command control system for its locomotives. If you’re Atlas and you have to choose one system, which one do you choose? Think ahead to 2023 or 2024 when these locomotives finally show up.
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.