Busting up large groups of JWs makes it easier to handle them - easier to spot apostates etc.
This is not a new technique - it is what Rutherford did back in the 30s when he was restructuring the JWs. He busted down the large congregations and made them into little ones. He dissipated the power outside of himself - smaller groups had less power within each one.
So much of what is going on with the JWs today is simply a re-make of the early Rutherford years. He, too, was dealing with a failing membership and the re-structuring and re-branding that he did leading up to the founding of the JW religion was largely successful. Maybe the WTS is trying to take a leaf out of Rutherford's playbook