Rambo IV was a decent attempt at trying to atone for the cartoonish,right wing propaganda that is Rambo 2 and 3.There really is no need to make another one.
I love all the rambo films and pretty sad about it i really enjoyed the 4th and know alot of people that thought the same.
I dont know why actors leave such long breaks before making another sequal Eg: indiana jones,Die hard and terminator now it seems ghostbusters 3 off the top of my head.
Why couldnt they of done these films when the actors were younger.
Maybe because the till-ringing nostalgia factor hadn't kicked in, amongst other things.
I know - bit short though, wasn't it? Just a brief moment at the end. Perhaps Sly wanted the viewer to decide what happens next, so fair play, I guess.