I wouldn't say that game started a new era.Won the World Test Championship, World Cup, World T20, held the Ashes for 8 years and been world no.1 Test nation for god knows how long. Been a great era. Not 90s/2000 great, not near that, but a great era, nonetheless. At our top we had Marus and Smith averaging in the 60s, Warner in form, Ussie on fire vas an opener and 4 bowlers at the top of their game. Now they are struggling with age. Stood out last year but we got away with it.
This era started on the back of the big purge after that SA disaster in Hobart in 2016. We made 5 changes, refreshed the side and never looked back, until now, where we now need another refresh with another 5 changes before the series gets away from us.
Those 5 changes we made after that loss were Renshaw, Handscomb, Wade, Maddinson and Bird.
Neither of them were still in the test team 13 months later when we beat England in Perth to wrap up the ashes in 17/18