No matter what you wish to think is happening, the $ is still king, and not threatened by any other currency, and as long as china sell stuff for those $, and pays its imports in $, there will be no de-dollarization.
That's because the US Dollar is still the reserve currency of the world. Not to mention, people aren't using Bitcoin as a "unit of account". Things would've been different if everything was valued in terms of Bitcoin instead of Fiat. In a "hyperbitcoinized" world, you would measure the value of goods and services in terms of "satoshis" instead of US Dollars or any other national currency. It sounds crazy but not far from becoming a reality soon.
There's only one way "hyperbitcoinization" will happen and that is if the current banking system collapses in its entirety. As soon as the USD and other Fiat currencies collapse, Bitcoin and other cryptocurrencies will take over the global economy. USD's inflation rate keeps rising, so it should only be a matter of time before people start losing faith in it. Just my thoughts