As Rooney most likely will leave Everton soon, here is a reminder of the difference that he had made for Everton this past season.
With his goals, Rooney has contributed 7 points difference to Everton in these matches:
Stoke : 1-0 (2 points)
City : 1-1 (1 point)
Brighton : 1-1 (1 point)
Liverpool : 1-1 (1 point)
Newcastle : 1-0 (2 points)
Everton finished 8th in the table with 49 points, without the 7 points and his other goals, Everton would be 13th in the table, with the same points as West Ham but worse goal difference.
Most fans agree that Everton played/would play better without Rooney. These are the 11 matches in the past season that Everton started without Rooney:
Burnley : 0-1, 1-2
Crystal Palace : 2-2
Southampton : 1-4, 1-1
Chelsea : 0-0
WBA : 0-0, 1-1
Bournemouth : 1-2
Arsenal : 1-5
West Ham : 1-3
Without Rooney slowing the attack and his horrible passes however, Everton only got 5 points from the 11 matches, with 6 losses, 5 draws, 9 goals scored and 21 goals conceded.
The influence of a player might be felt when he's gone, his replacement needs to be a quality player who doesn't have to adapt to the league for another season, someone like Mahrez maybe?