Yes, good point, there is a third (most important) element that can adjudicate Cllr behaviour - the electorate. But for that to work there actually has to be an election (rather than the usual insufficient candidates leading to an uncontested election AND there needs to be sufficient interest and engagement from the voting community to actually make a difference.)
As if having enough quality candidates for an effective election, and a sufficiently engaged voting public was not a big enough mountain to climb, you’d then face the very real prospect of a (so-called) vote of no confidence being interpreted as a preemptive, coordinated, collective act of bullying and intimidation which could place the instigator(s) in the dock.
I can’t imagine any way it could turn out well.