NOw that it ended like this. Since the beginning Ichigi's power has grown fast and strong every time he found his resolve. I think he will regain his Shinigami powers in much the same way.
Without Zangetsu keeping his hollow powers in check, I have to wonder about that episode in Hell and how Ichigo will have nothing holding his hollow powers from taking over.
So I say some of you are right, he may learn to master that part of himself now. Who knows, maybe by doing that it might revive his Shinigami powers as well.
Probably pointless to speculate at this point. Makes me wonder why they mentioned thr Spirit/Soul King now. :/