I wouldn't worry about Han's impalement from Marilyn Manson and subsequent tumble. He'll be back in the next movie as Solo the White!
Seriously, though. Vibe I got from him in the movie was like the cyclops from Krull, who could see into the future to where and when he dies. Kind got it ever since he was talking about how he didn't believe in the Force, but knows it's real now. Why else would he choose right then to go see his son and draw attention to themselves when they had a clear shot of escaping? Kylo's ability to focus his power is already pretty inconsistent, as he could tell they were on the planet, but not when he was 50 feet away. They could have set the charges and been on their merry. It was like Han was there to die.
As far as Luke's deal, maybe it isn't super sinister or even swervy as everything seems to suggest. Maybe they're going to play the guilt/burdened angle straight, and he exiled himself from everything and everyone because he really feels like the galaxy is better off. I mean, EVERYBODY is looking for the guy. And Leia and Han "went back tomwhat they weregood at" at an emotional rough patch, imagine multiplying that by virtually everyone.