Indeed manager, the national team and to some degree the Dutch league are struggling.
But maybe the Netherlands are just returning to their "natural" level? Looking at their population they've been punching well above their weight for many years.
Every team in The Eredivisie plays "nice" football. Good spectacles, but the tactics are naive and a lot of the player aren't able to cope against teams with stronger athletes. They need to adapt their training methods at youth level. They produce very sound technicians, but need to improve them in terms of the mentality and tactics. Sometimes you have to be more defensive and not always try to play beautifully. They still practice ideals from decades ago.