I mean big enough so a coordinated attack by some huge network or in example if some big banking cartels want to bribe 3 or 4 major pool mine owners to give full control of their network wouldnt be possible to corrupt and screw all up?

Sorry if im saying nonsense but i wanna understand better how the network survive if such attack occurs because thats the modus operandi of the plutocracy since 1700s so its not unusual to think they will try to control the majority of the supply of this currency.