I don't think it really makes a whole lot of sense for them to continue with the three roughly equal operational fleet structure for much longer. The three fleet structure made sense when china had a long coast line to defend, but lacking green or blue water capability it had no depth to its maritime defense, so it can't assure strategic mobility of its forces in time of war, and each sector of its coast would require its own organic coastal defense.
Once china acquire 2-3 operational carriers, the depth of her maritime defence obviously greatly increases, it would make much more sense to combine all of her blue water assets into at most two, preferably one single flexible operational command with responsibility for China's entire maritime frontier.
The 3 fleet structure might survive as peacetime administrative, logistic, reserve, dockyard support entities, but operational command of fleet at sea would concentrate, perhaps in peace time, but perhaps at time of mobilization, into a single structure.
If china adapts this integrated operational command structure, then she would be able to field a pretty powerful single task force of 2 carriers in much of west pacific, able to simultaneously conduct powerful strike operation while providing fleet air cover, with a third able to rotate with deployed carriers to support lengthy deployments, and function as attrition reserve, plus an additional forth vessel undergoing lengthier yard work.
