Two points to add re: the cultural capture of longtermism in EA: 

1. A count of topics at EAG and EAGx's from this year show a roughly 3:1 AI/longtermist to anything else ratio
2. All attendees of EAGx's received an official email asking them to pre-order Will MacAskill's "What We Owe The Future," a 350 page longtermist tome, with the urging: "Early pre-orders are important because they help the book reach more people!"