On the contrary, Africa is planning on its own continental currency, as is Brics. This has nothing to do with inflation. It has something to do with the dollar being expensive, and nobody sees any reason to use dollars when they can easily figure out the value of their own goods without the help of the dollar.

Why does South Africa have to pay Nigeria or Nigeria have to pay Kenya in dollars?

Why does Australia have to pay the EU in dollars?

70 years ago when this system came into being, it was based on the fact that America had an enormous gold reserve. That is not true anymore. More to the point, computerisation hadn't been invented yet. Now these things are done in split seconds.