He said he feels the club needs something new. So he understands it. How about not playing 99% of games for a start? He has to see drastically reduced minutes next season.
Yeah, one thing I really want to see from Koeman is actually using all 5 subs in every game. If Suarez (let's really hope not) and Coutinho will stay, if we'll bring Depay and/or Wijnaldum and with youngsters like Puig, Fati, Trincao, possibly Pedri (still think it's better to loan him to get regular minutes though) needing playing time we should have a better depth in midfield and attack than last season so there should be more rotations. There is no reason for Messi to play full 90 minutes against lower table teams at Camp Nou, especially when we're up 2,3-0 by 70th minute or so.
We have a few players who could play the Messi role. Obviously not as good as he when he's really on his game but it's very questionable how many times he'll look like at least close to his old self this season.
Let's hope for the best, can't really do much else.