I think people overestimate the task he has in hand.
The players aren't bad , in fact, the only reason we've been able to do well enough to finish 2nd and 3rd under Ole or go far in the europa league is based almost solely on the individual brilliance that some of our players have shown in the past three years. We are even better in terms of talent than those years at the moment, despite the team constantly struggling to win the ball back due to an uncoordinated press and an inability to build up quickly ( which teams with far less talent are able to do). For me, those are very much coaching elements, rather than the collective failure of individuals.
Chelsea are currently topping the league despite missing Lukaku and playing more inexperienced players like Hudson- Odoi or Chalobah. In fact, they haven't even had a striker for most of the season, yet they're able to churn out good consistent performances. Liverpool don't have a perfect team, they've usually had average partners next to Van Dijk and their midfield isn't necessarily perfect, but even when their squad wasn't as complete, when they had Milner and Henderson or Oxlade Chamberlain in there, that didn't stop them from looking dominant. Same goes for us under Sir Alex. Our fans should be optimistic.