That episode of TWD was BOOOOOOOOORRRRRRRRRRIIIIIING.
They have a real problem once they beat the saviors. It just feels like you are playing D&D with characters that are all plus +20. Yeah, I went there. And that new group reminds me of the gang from the Warriors with the leader that gets called chicken by his sister. I can't wait for the faceless 'war' to come. This show JUST may have jumped the old shark.
The ridiculous way the junkyard people talk (maybe you can develop some special dialect after 20+ years apart from everyone else, but not just 2 years or less) and their comically bad negotiating skills are the only real sharks out there, although Rick lobbing the katana to Michonne was a lot cheesy, especially after she was still reeling from thinking he was dead. If they had gone to commercial with Rick possibly dead, that would have been a sizeable shark jump, but they still should have shown him taking cover since I don't think anyone was really supposed to think he died (other than Michonne).
I really liked the Rick and Michonne parts, especially the way it was filmed and the sudden time jumps. Rosita being all cranky and a total dumbass, on the other hand - ugh. Yeah, let's go on a suicide mission instead of waiting a week to have a full army. Maybe if we are really lucky, we can be caught and tortured and give up Rick's plan.
Any series can have the same problem of not being able to keep topping itself in terms of the conflict. Buffy managed to go two more seasons after taking on a goddess. Somehow the Walking Dead managed to still be compelling between the Governor and Negan, so I am not worried. Usually trying to keep going bigger is what leads to a mess, like the more recent Die Hard movies. You still could go with a whole region with some bureaucratic military dictatorship, where there is no head of the snake to cut off, like the quarantine zone government in The Last Of Us, but I would try to find a way to bring more zombie danger back first.
Rick and Michonne were basically doing what people need to do right away in a zombie situation - clear them out until they are gone. Running and running just gets more people bit and makes more zombies. There is more than enough ammo to headshot everyone on the planet.
We probably will gradually get to know a few of the junkyard people and they can replace whoever dies in the next few weeks (my money is on Richard, one of the other main Kingdom people, and Sasha). I have figured there is the possibility of them turning, but Rick and company would be totally screwed in that case, and they have no reason to work with Negan. The really don't have much of a reason to fight him either, but desertion is not that compelling.