This is one of the reasons why I'm glad in canon they've made it so the war ends about a year after Endor, instead of the EU's version it persisted for *decades* with near total victories by the Empire repeatedly undone at a stroke. Seriously, how many times did they loose and retake Coruscant?!
This way it seems like the action of the OT actually had an impact as it set the stage for the generation of relative peace that followed. You can still tell stories in this period, but more personal, smaller scale stories, not the big epic space opera kind which are best saved for the saga movies anyway.
For the immediate aftermath I can see a series of books and/or comics in a similar vein as the old X-Wing series featuring a cast of characters fighting hold-outs, warlords and underworld groups taking advantage of the chaos and power vacuum. There's also potential for political intrigue/espionage stories about hunting down war criminals, collaborators and unaccounted for POWs.
Later on down the line when things are more stable there's always the potential to tell bits and pieces of Luke's attempt to rebuild the Jedi (though we'll probably have to wait for Ep VIII or IX to spill some of the beans first.) Similarly a story set entirely from the First Order's perspective to fill in some gaps between Aftermath & TFA.
A relatively peaceful galaxy opens up the potential for lighter more adventurous/fantasy fare. Stories of exploring the unknown, charting new systems, encountering pirates, vagabonds and maybe uncovering some very old, long forgotten mysteries.
I'd take any and all of that over the endless cycle of crazy super-weapons, the Solo kids being kidnapped every other week, isolated crises that have no long term consequences or do anything to advance the characters.
And with those two sentences, you render anything else you have to say on the subject utterly irrelevant. Bravo!
