If they push out the wrong representatives they will certainly retain and increase their majority. Consider this.
Soubry has previous form with defections. Having originally been a Liberal, she walked out on the Tories in 1981 to join the Social Democratic Party after its launch by the Gang of Four who quit Labour in protest at its march towards Hard-Leftism. She has always been the most vocally anti-Brexit of the band of Referendum Refuseniks clustered around her in what’s become known as Remainer Corner in the House of Commons, on the Tory back benches away to the Speaker’s right, consistently opposing anything except a Brexit-In-Name-Only-Remain-by-Stealth, or something barely distinguishable from it, despite the inherent hypocrisy.
Wollaston, too, is a flip-flopper, always in my view something of a false-flag ‘Conservative’ after being elected in Totnes via an Open Primary which the Tories managed to botch by allowing Labour and LibDem supporters to vote in it. During the EU Referendum campaign, she was initially Leave before switching to Remain in what looked like a planned, orchestrated move to damage the Leave campaign. More recently, she has opposed a second referendum, before U-turning and demanding one.
Allen’s 2015 election to represent South Cambridgeshire arguably owed a lot to her predecessor, former Cabinet Minister Andrew Lansley, but she has also been a serial rebel very much on the Left of the party who has often looked as if she would be far more politically at home in the Lib-Dems. Despite voting to trigger Article 50, she’s consistently voted to give the Commons powers to dilute, frustrate, or even block Brexit.
Good riddance. They belong with the other snakes. By elections should be held immediately when any MP is proven to be reneging on what they promised to their constituents.