That's true. I think what they need to do is either get some of the writers who penned action films in the 80s and early 90s to start writing new screenplays with room for cheesy-yet-funny one-liners, or take a bunch of current screenwriters and sit them in a room with a stack of action films from the aforementioned era that feature genuinely witty one-liners, and force them to take notes.
One coud argue that that kind of humour in an action film should be left in the 80s and 90s, but as so many recent action films have shown, the 'humour' being incorporated now is just falling flat on its face.