I think they could for example seek talent through the modding scene using the new tools or straight up buy assets or designs created by the modders. I have no idea if CDPR is interested in such things but it could be one way they utilize the new tools.
Fun fact, one of the modders once created a mod for The Witcher 2 called Lykaon which piqued CD Projekt's attention and resulted in them hiring this guy. He's now one of the lead devs and worked on Witcher 3, Cyberpunk and is working on the next Witcher, so these mods can definitely be a great hiring tool. But I don't think they are interested in buying assets created by modders, especially that Witcher 3 mods won't be compatible with anything they will do for future projects as technology used for them will be different
Mod tools aren't technically a new thing in The Witcher series as both Witcher 1 and Witcher 2 had proper editors and plenty of really cool mods. CDPR apparently wasn't happy with a lukewarm reception of Witcher 2 mod tools, but even these tools gave some really good mods (although less than TW1 had), including the one I linked earlier (Farewell of the White Wolf). This thing is basically like an unofficial expansion. So I guess they changed their minds over the years and decided to something like this for TW3
I think the main reason they're doing these mod tools is the fact they can see TW3 is still very popular after so many years and how often PC players tend to play with mods. So giving proper tools to community gives them more creative opportunities to create passion projects, which retroactively can extend the life of The Witcher 3 even further. Crazy to think that next year this game will have its 10th year anniversary
