I hope not, they really need a different angle. They were overrun by zombies at the farm, they were overrun by people at the prison, they were enslaved & eaten by people at Terminus, etc. etc. We don't need another re-run of the same story. That's what got me about 5 seasons of "Prison Break"...in the second season they just got thrown back into prison! I'm not watching four more seasons of that 😀
I'm kind of hoping this will be safe haven for them. But they're going to need something else to make it interesting. They mentioned the fortress was really strong against zombies (and people), but I think they still are having a gang-related problem with the Wolves.
This would also be a good segway into putting Eugene back into action. They could have offed him awhile ago - turned him into a zombie after Abraham's mega-punch, left him at the hospital, had him die along the way, etc. - but they made a point of having Abraham see the Washington monument, so I think Eugene still has some usefulness left & Abraham is going to help get him there. And they need a place to recover & get their mental health back in order. They did a good job of conveying how exhausted everyone was last episode, even Michonne.
I am also to the point of wanting more answers about the plague now. They don't even address the zombies anymore...they threw in the herd-crash this past episode & a quick one to kill off Tyrese, but it's about survival, other humans, etc., and since we've already gone the zombies vs. group & other group vs. group routes, I think they need to start figuring out a timeline of what happened, why it happened, how much of the world it is affecting (it appears to be 100% of it worldwide), and what they can do to fix it. Alexandria can offer them safe haven near DC, which according to Eugene has failsafes & weapons and stuff.
My fear is that they'll turn this into another "Lost" - write an excellent 3-season story, but then get extended for another 3 seasons, and end up with crap episodes & a garbage ending. So far this season has been pretty slow, so I'd like to see them get more focused on Rick again & really start moving the plot along.
My think is that regardless of the cause, they're also going to need to figure out how to cure the plague so they that they don't have to keep on being vigilant & living on edge for the rest of their lives, so #1, they're going to need to develop a cure, and #2, they're going to need to distribute it worldwide. Eugene had mentioned there were global aerosol distribution systems for managing mass chemical attacks & whatnot, so maybe that really exists in DC somewhere. That would be a really good storyline to pursue, especially since they have to fight through zombies & other groups to get to it.