As much as the constitution says they need 75% to disband the VTCA, in reality you probably only need half the clubs for the dominos to fall.
Just needs a big chunk of clubs to move a motion to disband, then the momentum will see others (probably enough) get on board - if they are bright enough to see the writing on the wall.
If they just fall short of 75%, they all resign from the VTCA, leaving the remaining clubs with a very small competition - good luck trying to recruit decent players then! It would be situation untenable, and the VTCA would then be forced to disband soon after that.