Given that the length of ~4-4.5 meters is a fixed constrain for all LRAAMs meant for deployment on the J-20/A/S, J-35/A, J-XDS and (partially) the J-36 in stealth mode, the race now becomes how to squeeze the best possible performance in terms of range (and also maneuverability) within the given length limitations.
For one, I do hope that future LRAAMs of such lengths (perhaps a further development of/successor to the PL-16) could have their nominal maximum ranges further boosted to ~350-400 kilometers. This should make every combat warplane (including UCAVs) in the PLAAF and PLANAF with ~4-4.5-meter long IWBs be capable of conducting expanded A2A operations by pushing the engagement envelopes further outward, thus increasing the chances of outranging and outgunning enemy aerial forces.