> Why would growth be bounded depending on the cause of that growth?
Totally fair question. I didn't mean specific causes are bounded (it doesn't matter if your conductors are yttrium or graphene), but I wasn't terribly clear. What I mean is that relative-growth gains are bounded in a way that absolute-growth gains aren't.
Relative growth (i.e. cutting better trade deals, capturing more share and profit on what exists) is constrained by existing wealth + wealth growth. So the pie you can steal from other countries, plus the fairly stable ~2% annual increase in the size of the pie. You can do a bit better than that by increasing internal efficiencies, and in fairness Singapore has done well with this - their health efficiency per healthcare dollar is sky-high, and it's not because they're pioneering radical new medicine. But even so, these effects are generally limited by international conditions and the size of your existing inefficiencies. (Again, to be fair, sky-high in China.)
Absolute growth I'm considering unbounded, or bounded at ludicrous heights. It's about increasing the growth rate of the pie (and capturing some/all of that growth). So industrialization, nitrate fertilizers, and similarly ground-breaking tech all let the pie grow faster and produced incredible pie-growth wealth. (Not computerization, an oddity for which I have theories but no one seems to have answers.)
All of which is to say that the larger your nation, in both absolute terms and percentage of globe terms, the harder it is to get rich on relative gains. Discreet banking was worth some relatively fixed percentage of money movement. That created huge wealth in Switzerland (and the Seychelles), but can't be scaled by employing 10x as many bankers. Bridging East and West with free markets, low-corruption governance, and a stable core city was worth some large amount of money for Singapore, but that can't be scaled by developing 10 such cities. These are tricks where you interpose yourself in the middle of an extreme profit flow, and if your group is small enough then collecting your cut at the margin makes everyone rich.
I confess that I'm overstating, though. My personal suspicion is that gross inefficiencies are a defining trait of most economic activity, and China is surely worse than many. So in that sense, it might be possible to pour money into efficiencies like health, education, and (sustainable) infrastructure and reap massive gains. It might be that 2% global annual growth can be locally beaten by just being less stupid, but Singapore and Switzerland were simply too small alter the global stats with their local improvements. So I could be vastly wrong - maybe handing iron rule of China to another Yew could produce 4% or 8% growth every year, even without any special breakthrough.
As for will happen, I think we agree there. Too much fragility, not enough political will.