There is most definitely a lot of ground left to cover. No matter what happens in the finale, next season will find the club completely shattered. If Potter is successful, the club will most definitely be over, I really don't know what happens there, but seeing as how there is a next season, I have to believe they'll wrangle their way out from his trap.
And even if they do survive, Jax will leave, Opie's out, Juice and Bobby are in prison. . . so the Sons will be Chibs, Tig, Happy, and Filthy Phil ????
I don't remember where I was reading it, but they were saying it was heavily hinted that Ethan Zoebelle was one of the investors in the Charming Heights project. It would be interesting to see
him come back with his white power friends and completely push SOA out of Charming, and then maybe have Jax be forced to come back and help his club and his home. . . have Jax leave Tara and his kids behind to mirror his father, and reinforce the tragic hero role of Hamlet.
One of the themes of Hamlet is the whole pyrrhic victory thing, so maybe what happens is that Jax does get his wish, and leaves Charming with his family, but in doing so it completely dismantles the club, and allows Charming to be taken over by corporate interests and then we see Jax dealing with that guilt. I think we'll have a lot clearer picture of what will happen once Gemma finally gives Jax those letters. It sounds like Gemma will dump her buckets of truth on Jax.
So yeah. . . there's a lot of mileage left in the show.