I think BG3 EA was necessary to finance the ongoing game development. I think that factor is no longer necessary, as it seems that the success of the game has provided sufficient funds for 2 new games. On the other hand, maybe Larian has taken a liking to the EA concept and will continue to do so, to stay in the spotlight and build a community. My gut feeling is that they will continue to release an EA of their upcoming games.
They stated pretty clearly more than once that they aren't doing EA out of necessity anymore (at least since DOS 2), but because they enjoy the feedback loop that comes from it.
I'm fully expecting this one to enter EA by the end of 2026 (or mid 2027 at most). And then who knows when the final release wil be.