The closest FFG class with similar dimension and tonnage plus similar/larger number of units per class to the present 054A/AG-class FFG is none other than the Oliver Hazard Perry-class FFG, with a total of 51 units built for the USN from the mid-1970s till the late-1980s, plus an additional 20 units for other countries and regions.
Hence, an additional 10 or more 054AGs to the current 054A/AG fleet of 40 ships in the PLAN isn't exactly extraordinary.
Similarly, raising the prospect of the PLAN having close to or more than 100 FFGs in the future shouldn't be shocking or deemed unachievable either, given China's unique geopolitical realities in the ECS and SCS along the 1IC (and that the 056As alone are no longer deemed sufficient to deal with foreign threats in the region).
Therefore, I believe that having 50-60x 054A/AGs for operations within and around the 1IC, coupled with (perhaps) 30-50x 054B(/Cs) for "true-blue" operations in the IndoPac theater should be good to go for the PLAN.