The US is using a 155mm gun on one class of vessel, and there are only three of those ships being built, so there will only be six such guns. They are expensive, but they will work very well shooting PGMs a long ways and directly for support of troops on land. They will be very accurate and have a very high rate of fire, being able to shoot many rounds from different angles and elevations depending on weather conditions so they all rain down on the targets at once.
That is what they are designed for. Anti-shipping duties are possible with these weapons, but with the 80 PVLS cells and the Tactical Tomahawks for anti-shipping duties, there use for that mission will probably be very limited.
For smaller, close-in boat threats, each vessel will have two, high rate of fire 57mm weapons.
And, the 155mm AGS is only a stop gap in any case. Within ten years the US will mount much more effective and longer range rail guns in their place, which are already being live-fire tested.
So, I highly doubt anyone saying that the PLAN intends a 155mm AGS look alike is accurate. What they are deploying on the 052Ds with the new 130mm guns will suffice and be more than enough.
I do not see the PLAN building a fire-support centric vessel like the Zummwalts. The Zummwalts are very neat vessels, with a lot of new technologies. There is a good likelihood that production on an anti-air centric version of those ships may come about to carry the large AMDR in full size that the Burke Flight IIIs cannot. If that happens, they may build 12-16 of those.
Anyhow, the PLAN may eventually put out a Burke III sized vessel of 10-12,000 tons. But I believe it is going to be some time before they do.
With the six 052Cs and integrating them into their fleets, and with what probably will be at least eight 052Ds (if not more) over the next 3-4 years, and longer if they build more, they are going to have their hands full building them and integrating them.
And, those 14+ vessels right there are going to give them a capability second only to the US Navy once they get them deployed. I would not be surprised to see a longer run of the 052D if they prove themselves as capable as they look, improving them as they go as the US has done with the Burkes. That would be extremely cost effective, and powerful. Those vessels will be very effective SAG Task Group leaders, and very effective escorts for the carrier(s) and amphibious vessels the PLAN is producing.