Hamza struggled initially, had a great season last year and has not scored big this year, lots of 30's and 40's. He is definitely a talented player. We have talent coming through, van Tonder, Bedingham, Breetzke, Rickelton, Marais, Malan etc.....it is just that they are not quite ready, along with nobody really putting their hand up and demanding to be selected. Markram did that, he kept scoring big runs could not keep ignoring him. de Bruyn has been dominating the FC scene this year though so need to be given a proper run.
We have 5 tests until the WC in May; 3 against Pak, 2 against SL. Unless there is injury they not gonna bring anybody in and will give the incumbent batsmen a chance to prove themselves. I think the next likely inclusion is Mulder, if he stays uninjured and shows any form. The we see who is performing and who is retiring from a batting point of view. Could find ourselves with 3 debutants, depending on Faf and Amla.