I might be off in Conspiracyville on this but here it goes. I once heard George Lucas mention in an interview that he told his father after American Graffiti had success that George's time as a teen dragracing on California backroads wasn't wasting time but research. In that movie Harrison Ford plays the guy with the best hotrod who blows everyone away, you know, the guy George wished he was. George drove around with a dog named Indiana, who inspired Chewbacca and a Nazi punching archaeologist's name. So, Harrison Ford plays both the guy who flies around the galaxy with Chewbacca and the Nazi punching guy, luckily Tom Selleck was busy solving crimes in Hawaii to accept the role.
At some point in the preproduction or production of Empire Strikes Back Harrison Ford suggests Solo should be killed but Lucas refuses. I'm beginning to think Han Solo is, like the guy Ford plays in Lucas' other movies, the imagined self of George Lucas. So in Force Awakens killing Han Solo is a metaphor for George leaving Lucasfilm and passing the franchises onto others, in fact most of Force Awakens could be viewed as changing of the guard. Unless I'm reading too much into this and need to get something to eat.