The more important question is why China would even need long range bombing capabilities beyond what the JH-7 offers in the next few years. It's just not a question of what capabilities your military has, but what capabilities it will end up needing. China's interests have not spread far enough around the globe to the point where it needs to begin developing those capabilities. To develop them prematurely is a waste of money, and hurts their ability to invest in better technologies in the future. Does this mean the PLAAF and the PLAN doesn't need to something better than the JH-7 eventually? Of course not, but the JH-7 performs the role it's designed for perfectly fine, and there's no need for any capabilities beyond that which some other project in development isn't already filling in for.
I don't see how anti-aircraft carrier missions will need stealth. My understanding is that because of protection from a carrier group, most of anti-aircraft carrier missions will occur WVR, where stealth is much less useful.
EDIT: A Mod should probably move this back and forth to the JH-7 topic, since we should be discussing Chinese Flanker variants right now.