Abbott yet again declines ABC invitation, page-41

Gillard replacing Rudd resulted in a (minority government) win for Labor.

Rudd replacing Gillard saved some furniture.

"....Turnbull replaced Abbott due to bad polls and then lost the senate....." 

The Libs would have lost a lot more if they didn't change to Turnbull, (even though it was a lackluster win, it was still a win).

Morrison replacing Turnbull hasn't saved any furniture, and is looking like an electoral disaster for the Libs.