until mushfiq thinks he should be stop keeping and somebody else may be given a chance we wont see a new keeper.
or if sometimes mushy gets injured we might see a new keeper.
anyway the chances he missed of samuels again ZIA was tough one. even if he had coaught it it wouls have not been his credit, it would have been luck.
against spinners or slow medium pacers when a keeper stands up, he has very little time to react if there is thick edge and ball deviates. and it gets harder when the ball deviates opposte to the ball was spinning or drifting in as wicket keepers general body movement and momentum is towards the natural angle of the ball and as if the batsman will hit it and he would never need to gather the ball or the batsman will miss the ball and he will get the ball. but if there is an edge and it deviates the opposite way of the wicket keeprs momentum it very hard to shift momentum
anyway mushfiq has also missed some easier ones at times but i am not sure whether there is a better keeper at the moment in BD who is less prone to mistakes.
so all we can hope is mushfiq becomes lees prone to mistakes in future.