How many of Salah's goals have been surplus to requirements though ? It's not like every single one has been a match-winner is it ? So he doesn't need to score 30 plus league goals to still have an impact. We only get 3 points regardless if we win 1-0 or 4-0. It's also generally accepted that the signing of VVD, along with the progress made by the likes of Trent Arnold & Robertson, has given us a more solid defensive unit. Therefore we may not be as reliant on the forwards to get us out of trouble next season.
Not every one of his goals has been match winners, but it's not as if next season you'll be able to choose his 25 most valuable goals and ensure the least valuable ones are the ones he misses. Plus scoring the second goal in a 2-0, or third goals in a 3-1 or even 3-0 win (f West Brom is anything to go by) aren't a match winner on paper but it has a huge effect on how the game progresses. That extra goal buffer kills the game and nips in the bud any chance of a late rally against. What has been unbelievable about his season isn't just the numbers, it's the importance of when he's scored them, in the vast majority of matches even where he hasn't scored a winner it's been the goal that gives Liverpool the comfortable cushion that means even their defense can't screw it up - games like Newcastle, Bournemouth, City, So'ton twice, West Ham twice, Stoke, Watford, Leicester twice, West Brom, Spurs. Obviously the 26% of your points that he's directly responsible for speak for themselves.
You may not be as reliant on him next season, but the point is you'll need to be better in other area's just to maintain this season's level. Whereas the majority of other top teams you'd expect any improvement over the Summer to have a direct relationship with an improvement in points, due to not having a single player playing at such an unsustainable level.
The example I'd give would be Spurs and Dele Alli last season. He was scoring at a level that I believed was nearly twice the normal level that I thought he'd achieve. That season Spurs scored 86 goals, achieved 86 points and Alli scored 18 goals. This season they're on course to get 76 points, score 74 goals with Alli currently on 8 goals. Their drop in points has correlated very strongly with being unable to replace Alli's goal contribution.