How typical, SA have a poor first test and are suddenly in decline. Steyn suddenly is a spent force, Philander is a trundler, Smith is a test from retirement, Amla is in decline, Du Plessis is exposed, etc.
I don't think SA lost this match primarily because of Johnson, but because of their poor display in the field and by Philander and Morkel with the ball in backing up an unfit Steyn. This is nothing new, the same happened in the UAE and against India, but in this case the media is pushing the line prematurely that the end has come. Johnson sure put some fear into the SA batsmen, but they are facing his new incarnation for the first time, and didnt we all predict that the going would be tough for batsmen? So scoring 200 is below par for me, but its not like SA were skittled for below 100. SA's bowlers need to step up next match to expose the fragility of the Australia top order.
Mark my words, SA will be back, Australia haven't won this series yet, and if they do end of losing or even drawing this series, this thread would be a bit ridiculous.
Let me even say, even if Australia manage to beat SA in this series, I would still consider SA a better team. They're batsmen and bowlers have had proven success over the past several years in pretty much every country, and none of their main players are looking at retirement soon. You become no.1 through years of repeated success. Six years unbeaten away from home is a record even the Aussie's of the late 90s/2000s didnt have. One poor series at home wont change my mind on that.
Having said that. SA clearly have a weak spot against Australia in their own country, though strangely not in Australia, the same way Australia have a weak spot against India in India.