Ugh, I'm sure that's how it'll be...Won't end for awhile. They already said they have enough content to go 12 seasons or whatever. Then they recently said they want to go 30 seasons like The Simpsons.
As far as the season finale, i'm sure it will be like The Governor storyline. They get into a big shootout, people die but nobody really important and Negan is around for another 1-2 seasons.