I think its more a reticence to change the rules because they think the rule is right
Why they can't find 50% of the party to back a VONC right now is beyond my understanding, that would be the simplest approach but again there seems a reticence to do this too
I think they hope he'll be pushed but I have this feeling he'll force them to rip the party apart and as it says above, he'll get the whole summer recess to continue being PM and change enough minds (he's that deluded)
Part of me really hop[es that is the case