They aren't. Disney/Lucasfilm has already stated there are 10 years of Star Wars movies in planning, and many include the current characters, specifically naming Rey, Fin, and Poe.

she's a mary sue, she can't due.

this would leave it unbalanced. after 8 films and countless other lore have you not realised "Balance" is true peace in this world there must be dark side and light side. its why even then they thought the Sith was extinct they wasnt.

If anything Luke is most likely closest to balance as if its gone by a lot of the other Lore he will have studied the dark side and realised Jedi and Sith are 2 sides of the same coin they are both the force

I would not be opposed to this. The Galaxy is better without the Skywalkers TBH. Luke is probably in seclusion because of it.

I used to feel the same way until I watched his TED Talk. You should check it out. I have a very different opinion of him now. It's on YouTube.

he's actually one of the best pure actors in SW. ever. I's love to keep him onboard.

personally I didn't like TFA much, but I did like the characters and on some level I could relate to Rey, and I love Daisy Ridley. I wish her the best though, and honestly letting SW take over your life cannot be fun with the fanbase to be honest.