If Russia or China invented the internet do you think they would hand over ICCAN?
That wasn't really an option, there was a lot of pressure behind. If that was not made the Internet management will broken in parts, not next day but will happen.
If the biggest parties (countries with high population density[1]) really want they can "simply" create their own incompatible "Internet" (no need for ICCAN, IANA etc.), and then put some glue here and there, to make that work outside their
walls.
The first business going crazy with that would Cisco, Juniper, Palo Alto etc. because if they would want to keep doing business globally, they would need to support many, eventually dozens, of different network implementations.
One time that happens, other problems appear like:
Well, now that I have my own internet with my own rules, if those kids (Facebook, Amazon, Rackspace, Google etc.) want to play in my ground they will need to pay $$$$$ to passthrough the glue, otherwise they will be glue blocked.
[1] think EU (as whole), India, China, Brazil, Russia, Japan (not high populated but very prone to create their own incompatible systems). Brazil for instance would certainly be one o the firsts to do that. We always had our own incompatible system for everything, like the old TV (
Pal-M) and the currently digital one (
ISDB-Tb or SBTVD).