I guess what we're all asking for is not to make it more like Skyrim, but to create a community outreach program and get all those wonderful talented modders to start treating TW3 as the standard platform.
Skyrim without the mods is a great sandbox but a really dull RPG. The Witcher's villagers are more believable in terms of dialogue than most of the main characters in Skyrim. Skyrim has become this legendary game because of A) the mainstream hype B) the mods. The Witcher has vast potential to be the next gold standard, it's just about getting the modders on board.
To all people that have doubts about Skyrim being dull, play what I call the Skyrim challenge with me. I dare you to name at least one memorable character and it's story arc. And no, "the dragonborn" doesnt count
The closest I can get to completing the Skyrim challenge is to say: that annoying woman warrior person that bugged me all throughout the main story. I really remember constantly wishing death upon her
That's about it
CDPR has realized one thing while creating the Witcher: having a blank-page protagonist makes the story-telling almost impossible. That's why ES games fail in terms of the story. How can you possibly empathize with a character that has no motivations other than saving the world. In the old days of Pen and Paper roleplaying you would get some character traits and background story to build your experience upon. And then video game devs decided that the most Immersive strategy is to make the protagonist a blank page. Although I love ES games in terms of their beautiful sandboxes, it pisses me off that they started the from-the-scratch character development trend.
So no, don't learn from Skyrim CDPR, just show the modders that your system is the best place for the community. Because it really is.