This is dumb, and subtly evil too. We can have the cake and eat it too:
The point is to keep the growth of scientific understanding and of technical know-how without producing too much physical crap that is hard to recycle and overloads the environment. We need to:
(1) move our economy to more non-physical / virtual goods and service - we're doing this, but we could do better, since there are still lots of "status goods" (with little practical survival utility) that are physical and damage the environment by their production and operation - the rich should be able to buy better VR-avatar spells or exclusive-in-game-diamonds or whatever instead of cars, yachts, expensive to maintain houses etc.!
(2) make warfare fully digital in means and virtual/economical in consequences - 99% of conflict should be cyberwarfare-with-low-environmental-impact - like in "hacking to steal coins from country X's national budget wallet", not "hacking to sabotage industrial infrastructure" (sure, people will still die when country X goes bankrupt and nobody living there has health insurance anymore, but this shouldn't happen that often...)
A solution for accelerating (1) would be increasing research into how to make virtual stuff feel real and be more and more addictive - real-world "stuff" should feel soul-crunchingly-boring to our dopamine addicted brains (why go on a cruise ship or travel to Tropifukistan, when you can ride a dragon around Hogwarts and earn $$ if you're good at it!) For (2) it probably helps that everyone getting to have WMDs makes everyone scared s`less of larger scale military conflict. Oh, and fear of communicable diseases also helps move towards (1), as we can see now, but I'd personally prefer alternative "solutions"...
So we're probably heading in the right direction, we just need to stabilize the symptoms/consequences of environmental degradation short-term, and to push-the-pedal-to-the metal to disconnecting our consumption-oriented economy from the physical world (and on a parallel track go for the space-colonization-game for actual physical action - the fans of "real war", could have it too, but outside Earth, heck they could even bring in the nuclear toys, space is large).