People have been saying the same thing about China and Russia since they got in a pissing contest in the '50s. Or if some fraction of Africa ever decides to work collectively. There are lots of 'what if...' scenarios that will radically change geopolitics and do wake me up when one of them comes to pass...
China is going to be a meaningful player no matter how far in the dumps they get, and India is doing fine.
The rest? lol.