In regards to Ford, he hadn't played the character in 32 years and most likely hadn't given it a second's thought in all that time, so to come back to the role that honestly, made his career just to kill him off seems stupid to me. If he had been typecast as Solo, I could understand his attitude, but he wasn't. He left the role behind long ago. If Han continues in the novels and they just don't address that pointless death, I'll be fine with it, but you know the rule, "if it's onscreen, it's canon", so.......
And as for Luke, his whole story is just moronic. In the OT, he's regarded as The New Hope", the one that will rebuild the Jedi Order, and the old novels and comics had him doing just that. But these movies gut that in favor of Rey which basically makes Luke's entire life pointless. A better way to go should have been having Luke's Jedi survive Ren's attack and Luke and his Jedi are searching the galaxy tying to find the fallen students. Rey is one of Luke's Padawans and the story could still focus on her without destroying Luke's accomplishments in order to build up Rey.