Baldur's Gate 3's Patch 7 added the promised modding toolkit, albeit without the ability to edit saves and levels. Larian Studios had previously announced the toolkit wouldn't support these features because of cross-platform technical restraints, and also because Baldur's Gate 3 is a licensed title and as such has certain restraints placed on it by Hasbro.
However, a user on Nexus Mods named Siegfre was quickly able to unlock the aforementioned features on the toolkit, allowing modders to access save and level editing. This has enabled endless possibilities, and the community is already throwing around fantastical ideas.
"Homebrew DLC, whole new campaigns… At this point, creativity is probably the only limiting factor. It'll be interesting to say the least!", reads a comment on a Reddit thread about the topic.
There have been calls for modders to remake other beloved CRPGs, like Dragon Age: Origins and Icewind Dale. The former is probably a lost cause because of the amount of voice acting you'd need to port over, but more classic titles like Icewind Dale, or even the original Baldur's Gate are slightly more possible. There's also the possibility of adapting beloved Dungeons & Dragons campaign books like Curse of...