New reserve currency?

For years the US dollar has been the reserve currency of the world. Oil prices are currently in US dollars.  

The current US government seems to want a more isolationist stance on the world stage. 

In my view we need a new reserve currency in the world and oil priced in something other than the US dollar.  I have no idea what this should be. Any change might take years. 

Sadly. the current US government seems hell bent on ruining the USA. In the next 50 years I can see China becoming a major power and the USA becoming far less important.