The other problem is that you need a captain to replace him and have exactly zero options not named Steve Smith. Head is the current VC but is hardly secure in his role.If this was an anime someone would have already drawn the ghostly figure of Steve Smith standing behind Marnus Labushade giving him energy.
Regarding Tim Paine:
On one hand Tim Paine has stunk it up with the bat this series.
On the other hand, if Australia win this test, he will be seen as the captain who successfully rebuilt the team, won the Ashes on English soil, only a year after one of the most shameful episodes of Australian cricket history. They’ll let him retire on his own terms after this rather than just dropping him unceremoniously.