Final FB?
I guess so, FB3 will be lucky to pull in about 500m worldwide. maybe 400m. Which just isn't good enough for what should be Wbros' 'star wars'
I could see Wbros scrapping the remaining 2 films due to the dwindling box office/Depp & Rowling controversies and start work on a new Harry Potter (might be Cursed Child but imagine WB will want to reduce involvement from JK beyond a 'created by' credit) which will easily gross over 1b (maybe 2b like Force Awakens). They'll want to restart the Potter films while the trio are still in their 30s anyway (and before Radcliff or Watson gets snapped up by another big franchise like Marvel or SW). I predict Harry Potter 8(or 9) will hit theatres in Nov 2026 (25th anniversary of the 1st film, with the dvd/blu out in 2027 to coincide with Potters 30th), then ongoing films every 2-3years (maybe a trilogy)