The answer to Eskom's problems is actually simple. Expand business to the off-the-grid industry.
That's an interesting point. Unfortunately a lot of the off-grid industry is a bunch of cowboys doing unregulated things without any concept of safety and seriously over-promising buyers. I'm not sure even Eskom would stoop as low as to compete with them.
I have heard 5 different solar-PV providers this month tell me that Eskom let's you feed back into the grid. They do not. There's a white paper out to discuss the potential... but nothing formal yet. If Eskom see you feeding back into the grid, they will disconnect you.
Certain municipalities DO let you feed-back or wheel to someone else, but you need to meet a very detailed specification and get a meter change to record your usage. These salesmen tend not to realise this and instead keep telling people about their huge savings -- the fact most of them can't even work out what the return is properly (FYI - a 20 year payback is NOT a 5% return!). Anyone pitching these kind of long-term financial investments really should at least understand finance...