in as much as injury is not avoidable, it is not something both the players, the couch and even the fans want to hear about a player. If it eventually happens, it's not the first time Haaland is getting injured. It happened last season or previous two seasons. I can't really recall the exact season but it happened and he was still able to maintain the lead even after being out for several weeks. I won't be surprised if the same thing happen this season. As we can see from the stats, Haaland is already leading with a gap of two goals and Palmer who's second on the table doesn't have equal support like Haaland to score goals as much as possible. Palmer scored four in their last match by the way but we still have a long way to go since we are just six games away out of the thirty eight.
While I do agree that Haaland scores a lot of goals and he is a key figure for Manchester City, lets remember that he has been there for two seasons, this is his third if I am not wrong, and City won last 5 titles out of six, with four of them coming back to back. So that means they were good before him as well, he is not the reason why they win, so if they won without him, I am sure that they will do that again.
Not like if Haaland gets injured, that means they have to play with ten players, they will just put someone else in, and they will win like how they used to win. This isn't a simple thing, and I agree that City would hurt a lot, like how KDB was missing last year and they had trouble, but they didn't become terrible, they were ok enough compared to everyone else. Haaland scores a lot on unimportant games too, not like he scores on UCL knock out stages that much, so what they are missing would be some player who will score 4 goals against league last.