In 50 years, I'll be dead, so I'm not too concerned, but what makes you think China will have a massive consumer economy ? Why would the less than $2/hour (in US dollars) that Chinese workers make now be any higher 50 years from now ? In our case (USA), our real incomes have shrunk since 50 years ago, and our minimum wage is less now (in buying power) than it was then. So what would make China so special ?
China is already seeing large wage growth and their consumption is already shifting towards high end goods that the US can supply. The average wage in China is not as nearly important as the number of people in China demanding goods and services that the US can produce competitively.
China is special because they are big and they are growing fast. You made the thread about change which means you don't look at what the world is today but how it is changing. You then target that change.
The obvious considerations are producing for US consumers, producing for European consumers, producing for Asian consumers, or producing for other smaller groups. The US should be trying to make inroads everywhere it can but IMO our best hope is China and our second best hope is Europe.