Mick, Christine and John must have been "sick of dealing with him", like some LB's eternal haters like to explain here, but it probably never crossed their minds to plot his firing. The master mind of Lindsey's firing was Stevie. And she probably had been plotting it since 1997.
Even Richard Dashut told that story of meeting Stevie in 2017 at one of her concerts after a long time of not seeing each other, and Richard explaining to her how he had spent the last 30 years trying to forget them (or something like that), and then Stevie proceed to tell him one of the strangest answers ever: "Don't you understand?! It's Lindsey! He did this to all of us!"
So, yeah, the woman has been plotting his demise since forever.