I was listening to Shilao and Yankeesama discussion from last week and their discussion about H-6 is quite interesting.  I get the sense that PLA really likes H-6K/J.  I am a big fan of the program too.  They made the point that H-6K is much better for PLAAF's need than if they had imported Tu-22M.  Tu-22M carrying 4 YJ-12s probably would not be able to go supersonic (not sure if this is true).  But one thing is for sure, H-6K with that much payload will have longer range Tu-22M with similar payload.  PLAAF has well over 100 H-6Ks and they can all carry 4 YJ-12s.  Even more surprisingly, they mentioned that there is now a replacement for YJ-12.  We have not seen pictures of it due to opsec reasons.  It will be really interesting for me to find out where this new missile may improve over YJ-12.
H-6 series is likely to be in service for a while.