It's true, they don't "make 'em like they used to". They make them in new, more efficient ways which have contributed to improving global trends in metrics such as literacy, child mortality, life expectancy, extreme poverty, and food supply.

If you are arguing that standard of living today is lower than in the past, I think that is a very steep uphill battle to argue

If your worries are about ecology and sustainability I agree that is a concern we need to address more effectively than we have in the past. Technology will almost certainly be part of that solution via things like fusion energy. Success is not assured and we cannot just sit back and say "we live in the best of all possible worlds with a glorious manifest destiny", but I don't think that the future is particularly bleak compared to the past