Assuming that cruiser construction is the new norm for the PLAN IMO is more wishful thinking than forward thinking IMO. You can call a 12,000t warship a "destroyer" if you want, but this is about as logic-bending as the Japanese calling the 27,000t Izumo a "helicopter carrying destroyer". The role played by the 055 will almost certainly be that of an air warfare command ship, a capability that the PLAN has hitherto been notably lacking in. And most definitely there are no trends in Europe, India, or Australia that could be comparable to switching from a 7,500t high volume construction to a 12,000t high volume construction. AFAIK there are no frontline surface combatants under construction or planned to be under construction in any of these countries greater than 7,400t with India's Project 15B being the highest at 7,400t; Australia's is the Hobart at 7,000t and Europe's is the (Italian) FREMM at 6,700t. Trying to compare the conversion of a 6,200t class destroyer to a 7,400t class destroyer (Project 15 to 15B) and saying this is somehow the same comparison as the PLAN (fancifully) switching from a 7,500t class destroyer to a 12,000t class cruiser (052D to 055) is like saying switching from mass-producing a scooter to mass-producing a motorcycle is somehow the 'same' comparison as switching from mass-producing a motorcycle to mass-producing a Lamborghini. Like somehow the costs are bearable, reasonable or justified because the tonnage increase is roughly "comparable" to what other navies are doing. Really the only way your dream will come true is if the 055's full displacement is actually closer to something like 10,000t (and this is still a very real possibility). More likely IMO is that the PLAN will have a full hierarchy of cruiser with cruiser roles in the form of the 055, a destroyer workhorse in the form of the 052C/D/E, and an ASW/local air defense frigate in the form of the 054A/B. A 052E upsized to 8,500 or 9,000t would certainly be more in keeping with current naval trends around the world. A mixed 12kt CG + 7-9kt DDG + 4-5kt FFG structure with more ships on the lower end would certainly be a balanced force IMO. If the 055 is closer to 10,000t full, an interim mix of 10,000t CG + 7-7.5kt DDG + 4-5kt FFG would have to see the PLAN waiting for a true cruiser design to appear.
I think his comparisons by mentioning Australia and Europe is because Australia's Hobart class is replacing the much smaller OHP class they have, and Europe's FREMM class are replacing much smaller frigate precedecssors of their own, and I think he's suggesting there is a trend for successor classes of warships of a given role to be higher in displacement to their predecessor classes.
Of course, I don't think that logic can be applied consistently, afterall the USN isn't replacing Ticos with a bigger class of warship, and the Zumwalt class was greatly truncated and not a replacement for Burkes as they were meant to be.
As for the 055's future orbat proportion, what you suggest is possible, but I think lethe's suggestion of 055's eventually replacing 052Ds in production and role entirely is not that fantastical either.
Lethe has brought up the possibility of replacing 052Ds in production with 055s in the past, and before it revolved around the idea of the Navy eventually shifting from a three tier blue water navy of 12k ton DDG, 7k ton DDG, and 4k ton FFG, to eventually one of only 12k ton DDG and 6k ton "FFG" where the FFGs make up the something like 2/3 of the surface combatant number and the 12k ton DDG makes up 1/3.
Such a change would have to be far into the future, like which only occurs starting 2030 or something. But I think such a fleet structure is quite reasonable, and compared to the USN's current force structure which has an overwhelming number of 9k-10k ton Ticos and Burkes with only very few smaller frigate sized blue water capable vessels.
Personally I think an order of battle of 24 12k ton 055s, 24 7k ton 052C/Ds, and ~50 4k ton 054A/Bs to be achieved by the late 2020s is plausible and reasonable, whereby the 052C/Ds and 054A/Bs make up the bulk of the workhorse fleet while the 055s act in the traditional cruiser role.
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