>The supposed US trade war on China has resulted in their GDP growing by a massive 5% last year.

I'd take those numbers with a grain of salt. China is known to play with the numbers to hit goals when they feel that they need to.

>The US will be plummeted into massive recession by those sudden changes, while the rest of the world merely trades with whoever are the winners.

The massive devaluation in the dollar would mean that the country would become incredibly attractive for manufacturing exports, which would prevent a massive recession.

>If, for example, China decides that it finally wants a consumer economy, and the Renminbi becomes a partial reserve currency, the consumer demand will be absolutely massive.

If you think that China is going to shut down the majority of its factories, move them to other countries, and let their currency float freely (well, freer than it is today), you're delusional.