After an atrocious first year for the Government, largely attributed to an unpopular and poorly marketed budget, Coalition politicians were hoping for a good start to 2015.
Dire polls, though, were compounded by Abbott's bizarre Australia Day knighting of Prince Philip - a "captain's call" which horrified his colleagues. Then came last weekend's phenomenally bad election result for the Liberal National Party in Queensland, in large part attributed to the federal Government's woes.
As backbench discontent grew and festered this week, it seemed no one was willing to lance the boil. While both Bishop and Turnbull covet the top job, neither wanted, perhaps, to be the person plunging the knife into Abbott. Memories of the anti-Gillard backlash are still fresh.
It was no coincidence, commentators believe, that when the move finally came, it originated in WA, Bishop's power base. Simpkins' motion will be seconded by another WA MP, Don Randall, and is supported by a third, Dennis Jensen.
Bishop - whose statements have been closely monitored this week - chose her words carefully yesterday, telling Fairfax Media she would oppose the spill motion out of "cabinet solidarity". Conspicuously, she did not declare Abbott to be the best person to lead the Government.
If she does challenge, she will, presumably, say that she was reluctantly co-opted and agreed to do so only in the interests of the Coalition and the nation.
This week, both she and Turnbull have stressed the importance of a united team. Like her, Turnbull, the Communications Minister, has otherwise kept his cards close to his chest.
As for the rest of the Cabinet, some ministers were said to be increasingly worried by the crescendo of noise from the backbench.
What no one knows is the level of support for Bishop or Turnbull - or even whether Simpkins' motion will be backed by a majority - at least 52 - of Coalition politicians. However, if the motion is not passed but is supported by a substantial number, Abbott may decide to call a ballot anyway, in order to resolve an untenable situation. He could even decide to bring the party room meeting forward to Monday and call a ballot then.
What seems certain is that, even if Abbott wins a ballot or if no ballot takes place, he will be badly wounded, and it will only be a matter of time before the requisite numbers mass against him. There, too, the parallels with Rudd's campaign to push out Gillard are instructive.
Whatever happens, the Coalition will lose the moral high ground. As Trade Minister Andrew Robb warned on Sky News, before Simpkins announced his motion: "If something happened on Tuesday which led to a spill, we would be seen as a bunch of amateurs."
Power games
Kevin Rudd: in power from December 3, 2007, to June 24, 2010.
Total of 906 days. Ousted in first term by Julia Gillard in leadership ballot.
Julia Gillard: in power from June 24, 2010, until June 27, 2013.
Total of 1100 days. Ousted by Rudd in leadership ballot.
Kevin Rudd: in power from June 27, 2013, to September 7, 2013.
Total of 73 days. Lost 2013 election to Tony Abbott.
Tony Abbott: in power since September 7, 2013.
By next Tuesday, the day of a possible leadership ballot, he will have been in power for 522 days.