While we all can agree that releasing modding tools would be ideal for the modding scene, at the very least CDPR could do would be to not actively prevent modding with their engine, or make it overly difficult to do so. I can't be sure if there's an actual correlation between the two, but games that don't allow modding, like Sleeping Dogs, or games that do allow rudimentary modding but make it so damn difficult that it borders on the point of active discouragement, like the State of Decay games, see the number of people playing and sales of the game in the years after release fade into obscurity, unlike Bethesda games. If The Witcher games allowed for the scope and scale of modding that, say, Skyrim has? I guarantee it would have a modding scene that would dwarf Skyrim and Fallout 4 combined and would sell more than Skyrim.