If the other boards want to take on the pig-4, then they can do that. But they are always disunited. Out of the 17 voting members of the ICC, the pig-4 controls only 7 votes (India, Australia, England, New Zealand, Oman and the two independent votes). In order to get to a majority, they need at least 9 votes. And they always reach this figure. When it comes to voting, smaller boards such as WICB and SLCB always side with the pig-4. And then they complain that their voices are not being heard.
When Tavengwa Mukuhlani of Zimbabwe Cricket was planning to contest against Greg Barclay a few month back, hardly any of the full members supported him. As a result, once again the pig-4 nominee (Barclay) was elected as the chairman of the ICC.
That happens because Pig4 generally shows the smaller boards a lot of dreams. They promise smaller boards one or two tours. That's what generally gets the smaller boards to do whatever they are told. That's how the pig4 is still a thing.
With this all one thing is clear these pig-4 wants to control game of cricket as mafia and in their presence we never have any positive change or development in this game because they are controlling this all just for their own interests, and they have no mind to do things to spread this game around the globe and increase the fan base and other marketing things which help for rising funds and increase profit of the ICC.
Small boards can't go together as many having their interests related to pig-4 specially like we know WICB and CSA never go against them as with this all others have never any worth because mostly are never been work as unit they could be stayed like this until we have any revolutionary change from inside this all mafia which is strong and doing this all and nomination of person like Barclay is mostly happened just with the help of inside politics.
The thing is, money controls everything. And Pig 4 got a lot of money. So they can easily manipulate anything they want. So it is really easy for them to through some money towards the smaller cricket boards, or promise them a tour here and there. That generally does the trick. We all know that smaller boards get good exposure when they play against bigger boards. So they cannot refuse as well.