Here’s an awful possibility: suppose the Tory Remainers join forces with Labour?
They get the no confidence motion passed first, with Labour’s help.
There’s then two weeks in which any grouping has the chance to form a government. The Tory Remainers, along with TIG, then vote for a new coalition government made up of Labour and themselves.
In other words, the majority of Remainers in Parliament join forces to overthrow the elected government, to stop Brexit.
If that doesn’t result in the Houses of Parliament being burned to the ground, I don’t know what will.
Update: This is more than just an abstract possibility:
Senior Tory MP suggests May will lose a no confidence vote in her Govt this week if she pulls the MV tomorrow – with his help? https://t.co/jTKUqIO4rG
— Tom Newton Dunn (@tnewtondunn) March 11, 2019
Update 2: To stop this the ERG could call a direct early election vote, which requires a two-thirds majority. But that’s 434 votes, which will require over 120 Conservatives to vote for it (assuming all the opposition MPs vote for it), and I’m not sure there’s that many prepared to take the plunge.