No, just no. I would prefer shooting myself in my own leg before I would touch the Workshop. Why? Because Steam has still no idea what they are doing with it! (Shown by paid Skyrim mods where the maker only got 25% of the money). But more important, the Workshop is most of the time overrun by idiots, morons, people who cant or wont read, people who can and do read, but still decide to ignore it and people who just have no idea and flame or downvote your mods for fun.
BUT that isnt the main problem. I quite often balance mods I download myself so Steam re-downloading them when the author releases an update is a no go. And as it is shown by the nexus already, many people dont even bother telling you which version of RimWorld the mod works with!
I know with the Skyrim mods for a lot of people the Steam Workshop never really replaced the Nexus.
Of course it hasnt! Because the workshop is a mess!
I think that because of this reason the workshop has the potential to become the primary place to find and download mods for Rimworld.
Never. Let. That. Happen. Go to the nexus, upload your mods there stay with the forum mod page! It works quite good so far!