| Of course a country’s stock market will perform well as that country ascends to become the world’s dominant superpower. The question is whether the power and influence of the U.S. will grow similarly over the next 150 years as it has over the last 150. To invest mechanically without thinking about what’s actually happening in the world is cargo cult behavior. |
It's going to be a long time before some other country takes over the "reserve currency/investment market of last resort" position the US currently has. No other market is even close to providing the deep liquidity and rule of law the US market has over a wide variety of instruments.
Sure, someone will eventually take over that role, but there are no candidates today. And, to your point: it was clear by the late 19th century that the US dollar would displace Sterling, but it took another half a century for that to happen. On the scale of current human lifespan, you can assume it won't happen at all.