1. At 6100mt surface displacement, the 052C is hardly a big ship. In fact, for a surface displacement of that figure, its remarkable you can put 48 honking big S-300 class missiles on it. Between 6000 to 9000mt, you have a whole range of super frigates and destroyers whose SAM capability ranges from 32 to 64 missiles, with smaller Standards and ESSMs. The fact the 052C packs 48 such missiles on that displacement with rounded launchers I would say is quite amazing, but there has to be some sacrifices made like one less helicopter.
2. I have previously pointed out that for larger and larger missiles, it becomes more safer and convenient to use cold launched systems rather than hot launched. It takes a little imagination why. The bigger missile goes deeper down the ship, which has its own dangers when the missile take off blast occurs near the engine room, fuel tanks and ammo storage. The stronger blasts require larger vent tunnels out of the cannisters and into outside vents, and all these means eventually such a setup means that hot launched systems for large missiles take up more space.
3. Its possible for cold launched systems to be more space compact than hot launched systems, eliminating the vents and side tunnels. The key to this is to develop squared matrix type launchers and move away from rotary launchers. Each launcher would have a separate blast container underneath the missile (the 052C launcher already has this scheme). Examples are the 3S-14E VLS launcher on the Talways, and the VLS launcher intended for the VLS Shtil. However, I'm not sure if the PLAN has such a system under development.
4. It may be possible that 052D may in fact retain the cold launched rotary launcher and show refinements on the radar equipment instead.
5. It may also be possible that HQ-9 development may also be a dead end, a missile that maybe inconveniently too big, and future development maybe focused on developing improved versions of the HH-16.
6. We can have a conceptual hybrid where the 052C's PAR can be combined with HH-16, but unless HH-16's seeker can be active, a SARH HH-16 combined with the PAR can only be possible if the PAR has separate transmit and receive elements, like an AESA, so the array can search, track and target (SARH) illuminate all at the same time. So far the only known vessels on Earth that has radars that can do all these things are the APARs on the Sachsen class and De Zeven Provincien class frigates with SM-2 missiles.