What they are doing this week will not work. The only way they get Trudeau out is by leaving caucas and sitting as independents. 15-20 of them sitting as independents is about all it will take to overthrow him and cause a leadership race. This secret ballot stuff and speaking in caucas looks pretty weak to the PMOs office likely.
I could be wrong but I am sure some of them don't want to risk losing their seats entirely prior to the next election and don't want an election till next year but want a shot of keeping their seat.