I posted at reddit my 2 cents 3 month ago: sorry in advance as my English and general writing is kind of sloppy again as I just lazy style repost this. I hope you get the point of my thoughts
Although I really would love to see persistent worlds for BG3 i doubt they will be possible or if even possible they will created easily.
I loved playing persistent worlds on NWN. I was so excited about the development of NWN2 and finally got involved in modding and mapping for a LOTR persistent world for NWN2 which, although it had huge really top notch areas never reached open release (remained in beta). Team got tired and NWN2 engine had some issues. Less stable. Not so much easy databank support at that time (2007-2008). One reason we got tired was the immense work on areas as they got so detailed. Although you could build really detailed areas in NWN1 too by placing tons of placeables / objects, generally mapping was much more like straight forward playing lego rather than painting some huge detailed canvas.
DOS and its engine really got me back in getting interested in modding and mapping. I never really released something big but loved to tinker around with the editor and importing assets.
My RL didnt make me play 100+ hours of games. I have to admit till now i havent played through DOS 2 but i put lots of hours into the editor and tinkering with modding possibilities.
I have to say the divinity engine is really great and a big improvement over NWN2. But the learning curve and effort you have to put into making a world is much higher at least as NWN1. I ,lways wanted to have something like NWN but DnD turnbased. For a persistent world although it creates issues. Larian really designed DOS and its DM mode really for small groups as in PnP campaigns.
Also I guess the times changed. There is so much on the market for having some MMO experience. I really regret there is so few local server still overview able group size and foremost selfmade stuff like NWN1 (ok there is minecraft and so on but....)
I just dont see this happen so easily with BG3 which development has other focus. I could imagine something based on the same engine but really tailored for persistent worlds, which could be quite successful. Still it is a shame that DOS2 engine capacities didnt make more numbers on modding and DM mode. I really wonder why. Maybe Stadia (although not being a fan) could be interesting to attract more people.
sorry for my English and sloppy brainstorm style writing.. just my 2 cents
To sum it up:
i'd really hope for persistent worlds like once in NWN but before seen otherwise i doubt, the time is still the same, the engine is made for player more than 10 and the quality of levels and assets possible in this engine could be too time consuming.. still i'd appreciate a surprise..