If Luke went to the Dark Side I'd be ticked. It wouldn't make an ounce of sense. He resisted the most powerful Force user the universe has recently encountered in the Emperor, yet on his own he just somehow decides to go for it?
I hope they don't go with a Kenobi lineage. People said it was a huge problem in the Prequels having the connections between Anakin and C-3PO, Tatooine, etc. so why would this be so great? Because it's Kenobi?
As for the Dark Side, the Prequels lead you to believe that Jedi rarely ever fall to the Dark Side. There's only 20 Jedi who have even voluntarily left the order (21 if you count Ahsoka), let alone turned. It's so unbelievable that in AOTC they don't even believe that Dooku could do the things they are being told.
If they want to do it I wouldn't mind...too much,if they made Kylo a clone I wouldn't mind...too much,if they go crazy and do EU the original casts kids are taking over I may need to go find some people and give'em quality time with a ball bat starting at the knees :behave
Some ties to what came before is okay,as I said a hundred times before the ability to clone is there-why not use it? if they decided to try and clone a force user to see what happens I can buy that.
If SOMEBODY had family that now is force adept know what? I can buy that (Obi,Mace,hell Yoda even)
I want the kids of the original crew to go on and be the ones who hold power in the galaxy and have to deal with the Empire that will be a part of that like it or not,let there be new blood and let them lead to new things and new villains,for now in say the next two films tie up loose ends with the story and go forward.