I honestly think they will. In my opinion, Mortimer, though he has for the most part struggled, has shown glimpses of becoming a good halfback. It will take some time, but he will get there IMO, and when he does, he'll be the next boom halfback. Hell, even next year he'll have a whole off-season training as our First Grade halfback, so that itself will help him.
Keating is a pure 5/8 in my opinion. If he and Mortimer can develop a good combination, and Keating can do a "Finchy" and chime in only when he sees fit, we'll be better for it.
Right now, the best thing to do is be patient. We have young halves who are erratic, but they are certainly talented. Give them time.
This is why, in my opinion, we should bolster our forward pack before looking at our halves and hooker. Try and get a prop or second-rower who runs like a train (Sika Manu would be perfect).