I wouldn't be dropping him just yet but if horses for courses applies to the bowlers he'd want to get some runs in his next three innings.
That goes without saying. He's in the team to make runs and if he continues to fail he should be dropped. I'm just making the point that for all the criticism that surrounds Warner, the thing that annoys me most is people saying he's not as good away as he is at home, and that applies to most cricketers around the world.