The legacy of those years in the 80s and 90s cannot be overcome in short order. It was a culture shock which poisoned us, and the next generation. We've always been a poor country - with two million-odd taxpayers it's hard not to be.
Having just returned from England (and having lived there), I've seen the intensity of European workers seeking a better life in England, willing to work hard. But in a country of millions of people, with the infrastructure to match, there is every kind of job. The country benefits from the intensity of the educated, motivated migrant. So does New Zealand.
Our poor may have failed in their choices. It is possible their parents failed them, and so on. Not everyone is capable of seeing possibilities, and that is a matter of education at home and at school. Otherwise, learned behaviour, among your peers, becomes the rule. Education has to dominate more, and that is where this country fails.