Assuming military ships from the US and/or other countries do start to frequently enter what China considers its territorial waters, I wonder if we will see 056's or any of the various older frigates doing the trailing. I also wonder if we will see accelerated building of 056's or perhaps even additional units of 054A or its successor design.
Well the PLAN already has a fairly continuous but low key presence in SCS near its islands, usually older frigates. 056 would be a useful asset to rotate through SCS stations, but they probably can't do very long patrols longer than a week or two at most if they're supported by a tender or dock at an island for replenishment.
054As would definitely be a useful asset to have on station as well, and in the medium to long term the PLAN should be looking to permanently station a small task force worth of ships in the area.
Over on CDF I suggested that by 2020 PLAN should have enough oilers and modern DDGs and FFGs to deploy say, two DDGs and two FFGs and an AOR to SCS on a permanent basis like they do with their Aden deployments. It would only constitute 1/12th of their overall surface combatant fleet, and they'd gain valuable operating experience as well as normalizing their presence in the SCS region and can conduct exercises with friendly countries in the region, possibly contributing to anti piracy which is becoming a potential issue, showing the flag missions, and of course monitoring USN or any JMSDF ships that enter the area.
The DDGs and FFGs don't even all have to be 052C/Ds or 054As. An 052C/D accompanied by a 052B, 051C, 052 or even a Sov, along with a pair of frigates of an 054A along with another 054A, 054, or 053H3, would be a competent force but relatively low key to gradually get the region to accept greater PLAN presence in the area.
They could even potentially deploy another task force permanently to ECS and beyond in the same way, to start and get the world prepared for future larger scale and permanent deployments of PLAN forces around the region and globe.