Can they? Sure. But that's not the same question as: are these guys GOOD or better compared to other players at their position. To say "they aren't the main problem" is NOT the same "are they good". Mauer is closer to the worst 1B in baseball (by WAR) than a top 5 1B. He's 18th in FWAR. He might accumulate 1.5 WAR if he's lucky the rest of the way. He's just not that good anymore. It's a bummer, because when he was "Mauer", he was one of the best pure hitters we've seen. But he's not that guy anymore at all. Dozier is better compared to other 2B than Mauer is to 1B, but not a by a ton. He's going to accumulate around 2 WAR, which is fine, but not exactly good. They'd be lucky to get a top 30 prospect for him at this point or even a top 100 one. In other words, they might not be the biggest issues, but they aren't exactly going to carry this team either. They are mediocre players, likely nearing the end of their careers.