Messi should only play in big games and should be brought on as a sub if the team is in trouble until he is fully fit. I don't know what is the problem with messi but for one thing i know is that he is tired and he needs rest. I believe someone will step up in his place in btw but he needs rest, that is pretty evident from this world cup. There is no saving himself for the world cup BS he just isn't there physically and that is no way called decline. I think his skill improved and it never stopped decreasing in his entire career. His finishing his passing those little bursts and dribbles nothing reduced, they improved imo. But he had very less stamina and could not do those amazing things more than 4-5 times. People calling him lazy or not good enough and all are pure haters. We all know he is not the leo once we know but imo his skill never dropped and it only improved. He became more of provider and he is not to be blamed for missed chances.
Anyway we are making too much out of his form, he is still the best. With proper tactics we will see a different messi all together. Imagine messi in a possession based team like spain or germany. He would have won 2 WC at least. People who say messi is best in counter attacking football they are wrong. Messi is not known for his pace he is know for his acceleration, he will be at his best if we play tiki taka again or close to that at least. Without possession messi looks lost most of the time like ronaldo in every match. Ronaldo has insane physique and speed, the counter attacking football suits him but not leo. We have to bring back the passing game, not the lateral and useless passing game. The real tiki taka, which made barca invincible.