Yep, I also think that
@Trykz you overstimate this number
If it was also "important" as you think, why Bethesda is almost alone (especially on consoles...). If it represented any kind of possible income for Studios, I think Bethesda wouldn't be "alone" since a long time. All game would have their own modding tools and plenty of mods (or an easy way for create mods). But it's not the case, Bethesda is an exception.
Another example, Minecraft with very huge players base, with huge numbers of mods (the most popular have "alone" more than 200 millions of downloads) But players who use mods are a minority (I think less than 1%), so obviously Mojang (now Microsoft) don't care about mods
But if CDPR care about modding tools and mods, it already a great new... It's already better than most of studios