I don't think I can really disagree with this article. But how can we know that:

-despite the successes of growth in improving the situation of humanity in the last decades, growth will keep improving humanity? Is it just plain optimism and extrapolation (which is fine in its own I guess) or is there a mechanism to point out?

And:

-isn't just pointing out the doomsday-prophets where wrong and extrapolate that into a vision for the future exactly the same mistake as they were making?