Except they are not sticking their necks out... there is zero risk to them in reality.
They will never get re-elected in their existing seats. They may target marginals, but it will be unlikely they will make impact, merely hoover up a combination of anti-Tory or anti-Lab votes, and even that they will share with the LD’s.
However all of this posturing will set them up all in 500K a year ‘consultancy roles’ for life. See Clegg, D Miliband etc.
It’s that easy life that is exactly what will happen.