I'm feeling very downcast that basically everything has gone wrong in the last 3 games, but the melodramatic negativity in this thread has forced the contrarian in me to start thinking positively lol
Let's put this in perspective- as good as the 2015 CWC was, we NEVER capitalised on it by becoming a consistent, elite ODI team. Did we really have the players to do it? Hell, we went straight over to hapless England after the CWC and let them beat us. The narrative that we have got consistently worse or fallen off a cliff is just fake news imo. Pretty much since 2015 we have always been around 3rd-5th best in the world, won more than we lost but tended to struggle against the top sides. By historical NZ standards we are and have for several years been a good side, but really we were only elite for 1 season when the stars aligned.
We knew that India, England and Australia were better than us coming into the CWC and it turns out they are the only teams above us. We knew we had to ideally win 5 straight games to make the semis, and we did. We beat the likes of WI, SA and Bangladesh who were the other contenders for a semi final spot. Yes, there is an argument that we have only been 5th best and qualified due to the rain out against India, but that depends on whether or not Pakistan would have beaten both Sri Lanka and Bangladesh in what would have been high stakes games - far from a certainty. Fact is we beat who we were supposed to beat, did what we had to do and got into an almost unassailable semi final position.
Our frontline bowling for this tournament has generally been Boult, Henry, Ferguson, Santner- basically the attack most of us have been asking for, so we should be praising the set-up for finally getting the line-up right, and the attack for doing a pretty good job.
We know there are a couple of holes we haven't been able to fill in the batting but we also know that we have Taylor, KW and Guptill. 3 world class bats and an attack that is functioning pretty well. It doesn't make us a better team than the big 3, but it certainly means it's possible we can beat them in a pair of 1-off games. How is this any different to the situation for the last 4 years? I actually feel like the CWC momentum was lost immediately after the Cup and by basically the same coach and players who got us there. Blaming the current lot seems a bit revisionist.
tl;dr we are still a decent ODI team, maybe 4th best in the world, with enough good players to spring an upset and possibly 2 upsets, especially if a bit of luck (which is a thing, and has been against us) goes our way.
......we'll probably bow out meekly in a semi-final again though, in which case we are about the same as the majority of NZ World Cup teams over the years.
Disclaimer: None of this is meant to suggest that we should just accept being 4th best in the world and not try to improve. But stepping back from it, it's not objectively a disaster.