It's a question of judgement.
Our players, for the most part, are average to decent. Except for Mane. I remember during the streak of form early in the season, some on here got carried away to the point that the likes of Lallana, firmino, coutinho got overrated beyond analysis. Decent players have good periods too you know, you've got to keep your head and wait for the overall effect over a season. You do that, these players, performances, results are not so surprising. It's not some unfixeable mess. The reasons are precise.
If Klopp can see that and finally puts his own, significant stamp on the team in terms of personnel, he'll have the chance to give it a proper go. We'll get the chance to assess him properly, even if he's found not up to scratch, he can honestly say he gave it a good shot. Right now, a fair number of the players from the previous era are patently not top level. They're not poor, they are good pros, it's all just meh. He doesn't need to hang on to them. If mere 'decent' is the dominant level in the squad upper mid table is where it belongs.