Modding is about quality not quantity.
There is a post in this section from a guy who installed 241 mods in one go and wondered why his game wouldn't start. I run about a tenth of that number and I didn't install them all in one go. I used to run between 200 and 300 mods with Skyrim but again I didn't install them all in one go.
As for an actual hard number, I don't know. I've not seen any numbers bandied about and I would say that at this time there aren't that many regularly updated mods around so any potential limit is still hypothetical. There's too many unknowns at this point e.g. what, if anything, Larian will do vis-a-vis modding tools. If there is a demand and a modding community appears then any Larian limit may be circumvented by modders.
