I think this summer is terminated.
No one upcoming film have the appeal of "big event" a la "Avengers 2" or "Jurassic World".
The rest of these movies could be happy if cross the $200M line. We'll don't see another +$300M beast til Christmas...
TF4 was "ok" in the context of this saga, but was the worst movie of the series, i think this will gonna hurt the fifth movie. perhaps under $200M domestic.
I don't think so.
Cameron will chose some veteran A-list composer, probably Alan Silvestri, John Debney, Danny Elfman, Hans Zimmer...
if he choses a modern composer, will be some A-list too, maybe Michael Giacchino, John Powell, Steve Jablonsky, David Arnold, Harry Gregson-Williams....