I largely agree with you otherwise (viz. South Africa is on the whole improving) but on this specific point I think you’re optimistic. When summer comes round I’m pretty confident Eskom will start loadshedding again, and their public statements more or less align with this.
Regardless: not a sign of decline! Loadshedding is evidence that demand > supply, but that doesn’t imply supply is decreasing or the system as a whole is failing. On the other hand, there’s plenty of evidence that supply has steadily increased since the 90s, new facilities opening and what not. Widespread solar will only improve the situation as the tech improves.