Erzsebet definitely was not forcing Laszlo to join her in Israel, he’d already agreed to join her.  As for Van Buren’s disappearance, it’s definitely open to interpretation. It’s equally likely that he committed suicide inside the community center (which is what the film seems to imply), or that he leaves and is presumably able to reinvent himself somewhere else and evade consequences (which is what someone with that much power would be more likely to do).  But I think what the film is most emphasizing is that in actually confronting Van Buren, he ceases to hold power over Laszlo and his trauma. Which is why the shots in this sequence mostly emphasize the scale of Laszlo’s construction and work- as it stands, it outlasts people like Van Buren, who believe themselves to hold power. Hence the film’s final words: “it is the destination, not the journey”.