Genuinely don't understand people who want Jaime dead now. He's got so much of his arc left to go through and you want to kill him off now? For what? Shock value? That isn't good story telling, that's just killing for the sake of killing.
Same was true of Robb.
The idea of "characters go through arcs and then die" is antithetical to what made GoT so novel as a pop-culture fantasy property. It is the difference between, say, Saving Private Ryan and Band of Brothers.