Esports take place over rounds or matches, which have defined lengths and objectives.
BG3 is a story based game where players can go long times without fighting at all.
What you are explaining would require a dedicated battle mode where players just engage in fights, stripped away from all of the accompanying story elements.
Larian has expressed no interest in adding this sort of gameplay to BG3, though they were producing a now scrapped DOS2 spin-off like this.
But even if they did make something like this for BG3, there is pretty much no chance it would gain popularity in the crowded esports arena. This isn’t what people look for.
And BG3 as some form of MMO is a pipe dream.
This isn’t the sort of game Larian is making. It’s not going to happen.
I think I have a feel for why you don't think BGIII esports is likely. It is like a book reading isn't likely to become an esport. Lets keep going with the idea though, as there might be life in it yet.
We have considered BGIII as a game of American Football, Mountaineering and Trans-Atlantic Sailing, so how about seeing it as Snooker?
Somehow Snooker is considered a sport. There are even snooker computer games. The commentary of snooker is a large part of the entertainment. (There isn't much going on on the table!) Snooker has huge TV audiences (perhaps because it is cheap television it gets made.) We could perhaps enjoy watching a multi-player game of BGIII with a Snooker commentator's voice. Something like that, or a Royal Wedding commentator or the words almost whispered as with David Attenborough and the gorillas. A wildlife documentary commentary might be very suited to the game. The party sneaking up on a monster could be just like a pride of lions preparing an ambush on a deer. The role of the commentator here might be similar to that of person who tracks the score and puts up the runs, overs and wickets at the pavillion in cricket. The players would be focusing on their game, the audience would be following the game, and the commentator would be doing the math, running the statistics and relating the progress to the audience.
If there are 4 people in a multi-player stream, then this sort of commentary would need an extra "player". The commentator would be the one actually doing the streaming, and it would help if they were able to easily switch between the desktop/game view of each of the other players, and if possible the monster's too.
