AFAIK, modding is the main reason for Skyrims long term success. Sure, it did its part in inspiring people initially, but what keeps at least me coming back is my interest in trying new mods.

But it also didn't start there with Elder Scrolls series. Morrowind, Oblivion, Fallout 3 and New Vegas use a very moddable predecessor of the Skyrim engine, and thus build the community up for Skyrim and later games.

Modability of KC:D was rather limited, so there isn't a community around as big as the Skyrim one. That means with Skyrim, you get what you can mod into it, while with Kingdom Come, you mostly just get what you buy.

So I don't expect it to be the next Skyrim, but never the less I am interested in it.