Don't forget the last few 054A's have had some considerable upgrades, since the earlier ships of the class.
I think though, we are nearing the end of the 054A class anyway, and in the second half of this decade we will see the start of the construction of the next class, ie 054B or 057.
Regarding 052C.............the last 4 of this class, started construction
before 052D!..........(its been mentioned before, but to recap), after the intial 2 of the class were built some 10 years ago, Destroyer production in China ceased for sometime, and people wondered why. This was primarily down to the fact that China's premium warship shipyard 'JN' underwent a major change, ie the shipyard moved location, and therefore during the the latter part of the last decade was out of the picture so to speak to construct warships.
When the relocation of 'JN' shipyard was finished, Destroyer construction of the 052C class resumed with a further 4 vessels being constructed. These 4 newer vessels were an improvement on the original 2 vessels, having upgraded electronics, but most notably new gas turbine engines.
After the 6th in class 052C was launched, the next Destroyer constructed was the first in class 052D. Now as this was quite an improvement over the 052C class, the Chinese Navy were obviously very keen to get their hands on this vessel, with its upgraded AEGIS system, and its multi-missile VLS suite, so it has appeared to of had its construction time reduced to get it into service. Meanwhile the last 2 052C's have obviously taken a back seat to the 052D, as shown by the long time they have taken to outfit, and join the fleet.
Therefore to sum up.........the 052C's are now done and dusted, ie no more 052C's!
ps: i like your name :-
brainsucker