I'm not an expert on Ben Yedder frankly but judging from what people who have seen him play for his entire career say, it doesn't have to be a success. I have, however, seen plenty of disappointing players replaced by highly coveted flops here in the last few years. The problem is about the service. Look how many goals Lukaku scores for Belgium. I do get that Ben Yedder (if people are right about his playing style) is a better fit, though, so here's hoping.
Maybe it's just misery on my part but it's hard to see us improving with JUST adding different players.