Depending on how they change their balance. A balance mod. If they don't strip out the outrageous surface everywhere and archers throwing 5 bombs in a row, I hope to see a mod that becomes more faithful to 5e and balance encounters to something a sane DM would do.
Solasta is a faithful adaptation from what I've seen but with a MUCH MUCH smaller budget, so I hope to see a mod for bg3 IF larian doesn't pull back on the stuff and adjust things by full release. (I say IF bc Larian can be stubborn with things)