Hope Vs. Fact

I think over a period of years we will see much greater drops than your estimate.

And yes it is completely intentional, the only way our governments can (try to) dig their way out of the huge holes they have dug is to devalue their currencies against real goods = inflation at "reasonable levels" which is really just another tax on all but the richest citizens.

Currencies of countries with more sensible people (or less blatantly robbing the poor to pay the rich and that currently include Thailand) running their banking systems and government finances will continue to strengthen against our home currencies in future decades.

Particularly if you are American, British or of the Euro zone - Canadians and Aussies may do a bit better, we'll see, don't know about South Africa.