Will saving for a rainy day come back in fashion?

[FlashDangerpants]

Wow! There's billions to be made here.

South Africa's interest rate is at 7.25%

All you people with surplus cash suffering negative interest rates, come buy all of our debt and undercut our reserve bank.

That's a normal activity.
https://en.wikipedia.org/wiki/Hot_money
Although obviously 7.25% puts you behind Turkey in that queue, so good for you.