And in the long term?
We envision 2.1 as our last major update of Factorio, and we will shift the focus onto long term support. So things like bug fixes, platform support/compatibility, modding features, etc. Other than that we feel we’ve reached a good place to conclude the active gameplay development.
Yup. They talked during the leadup to Space Age that all those big new systems are setup specifically to be generic, for the sake of future modding.