Peak Attention

There is a school of thought that economic growth can be decoupled from growth in material throughput (including use of physical resources).   For example, see some description of this at:
https://en.wikipedia.org/wiki/Ecological_economics
However, I find myself a little troubled by this line of thinking.  Decoupling, if achievable in the short-term, might help reduce the projected future impacts of human activity on the environment, for example reducing the trajectory of carbon emissions.  It might therefore be very beneficial to do it.  However, I fear that it isn’t a ‘get out of jail free card’ in the longer-term, and therefore we will still need to face problems with the existing mainstream economic paradigm of perpetual growth .  Here is my thinking, for the longer-term.
Suppose we do, to a large degree, decouple economic activity from material throughput, for example by increasing the amount of services (eg entertainment and leisure) that people buy and consume without significantly increasing the resources used in the supply chain for those services.  Then, a new limit will appear – what I would call ‘peak attention’.  There is a limit to each person’s ability to pay attention to things.  The customer consumes entertainment services by paying attention to them, and during that time they are not paying attention to many other things.  Ultimately, they will only pay for things they can give attention to in sufficient quantity for them to feel they have had value for money.  They are not going to pay for things they give too little attention to.  Therefore, when that person’s life is full of things they pay attention to (they spend all their waking hours giving attention to these things), they will only buy something else to pay attention to when something else drops from their attention. They will buy to substitute things in their lives, not to add to them.  Their total propensity to purchase will be limited by the hours in the day they can give attention to things, even if they have sufficient financial resources to buy more than that limit.  
So there is an attention limit for each person, which limits their economic activity, irrespective of decoupling from material throughput.  And if we accept the likelihood of peak population globally, then the implication of putting these two things together is that there will at some point be peak population, peak attention and peak economic activity levels (in financial terms) on the planet.  Therefore, economic growth cannot continue indefinitely (forever) – it must reach a peak at some point, beyond which it does not grow any more.