I think that Rain are going to have to offer some very attractive 5G deals very soon. The current cost of the 5G router will also have to drop substantially to attract the tens of thousands of new customers that they will need.
Cell networks are very expensive to build and they will require hundreds of thousands of customers, if not millions, to become profitable. Both Cell C and Telkom are struggling to become profitable and they already have millions of customers as well as additional voice and SMS revenue.