Billionaires are not a thousand times happier or healthier then millionaires. Growth is overrated.
There's a baseline of wealth that we must sustain, then we need to focus on horizontally scaling that baseline to as many people as possible, and finally, we must work to sustain that scale too. Growth appears twice in this equation, but always at a very well defined scale. We need to grow to reach the baseline, and then grow to have everyone base-lined.
Once we have achieved the above in a sustainable way, then we should focus all our remaining efforts into having fun, being curious, enjoying ourselves, and enjoying each others company. This should similarly be handled in a sustainable way. A heroine high is not a sustainable enjoyable and fun activity. Going for a walk along a park or a coast is. The dosage is important, a night out partying here and there is sustainable, day after day of it is not. Sprinkle in some learning and curiosity, I for example, would keep coding for pleasure. In fact, sustainability will probably motivate people towards sciences and technological advancement even faster, as we'll finally let free of our intrinsic motivations to do so.
To quote Nietzsche: "To escape boredom, man works either beyond what his usual needs require, or else he invents play, that is, work that is designed to quiet no need other than that for working in general."
The first part of that quote is Growth, endless, unhealthy, never ending Growth, simply to address our own boredom. The second part is sustainable life, easy, playful, and fun.
I really hope as we progress, I stop hearing about Growth, and I start hearing a lot more about Sustainability.